source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48 #include "dsdb/samdb/ldb_modules/util.h"
  49 #include "lib/util/binsearch.h"
  50
  51 #define W2K3_LINKED_ATTRIBUTES 1
  52
  53 struct replmd_private {
  54         TALLOC_CTX *la_ctx;
  55         struct la_entry *la_list;
  56         TALLOC_CTX *bl_ctx;
  57         struct la_backlink *la_backlinks;
  58         struct nc_entry {
  59                 struct nc_entry *prev, *next;
  60                 struct ldb_dn *dn;
  61                 uint64_t mod_usn;
  62         } *ncs;
  63 };
  64
  65 struct la_entry {
  66         struct la_entry *next, *prev;
  67         struct drsuapi_DsReplicaLinkedAttribute *la;
  68 };
  69
  70 struct replmd_replicated_request {
  71         struct ldb_module *module;
  72         struct ldb_request *req;
  73
  74         const struct dsdb_schema *schema;
  75
  76         /* the controls we pass down */
  77         struct ldb_control **controls;
  78
  79         /* details for the mode where we apply a bunch of inbound replication meessages */
  80         bool apply_mode;
  81         uint32_t index_current;
  82         struct dsdb_extended_replicated_objects *objs;
  83
  84         struct ldb_message *search_msg;
  85
  86         uint64_t seq_num;
  87
  88 };
  89
  90 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
  91
  92
  93 /*
  94   initialise the module
  95   allocate the private structure and build the list
  96   of partition DNs for use by replmd_notify()
  97  */
  98 static int replmd_init(struct ldb_module *module)
  99 {
 100         struct replmd_private *replmd_private;
 101         struct ldb_context *ldb = ldb_module_get_ctx(module);
 102
 103         replmd_private = talloc_zero(module, struct replmd_private);
 104         if (replmd_private == NULL) {
 105                 ldb_oom(ldb);
 106                 return LDB_ERR_OPERATIONS_ERROR;
 107         }
 108         ldb_module_set_private(module, replmd_private);
 109
 110         return ldb_next_init(module);
 111 }
 112
 113 /*
 114   cleanup our per-transaction contexts
 115  */
 116 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 117 {
 118         talloc_free(replmd_private->la_ctx);
 119         replmd_private->la_list = NULL;
 120         replmd_private->la_ctx = NULL;
 121
 122         talloc_free(replmd_private->bl_ctx);
 123         replmd_private->la_backlinks = NULL;
 124         replmd_private->bl_ctx = NULL;
 125 }
 126
 127
 128 struct la_backlink {
 129         struct la_backlink *next, *prev;
 130         const char *attr_name;
 131         struct GUID forward_guid, target_guid;
 132         bool active;
 133 };
 134
 135 /*
 136   process a backlinks we accumulated during a transaction, adding and
 137   deleting the backlinks from the target objects
 138  */
 139 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 140 {
 141         struct ldb_dn *target_dn, *source_dn;
 142         int ret;
 143         struct ldb_context *ldb = ldb_module_get_ctx(module);
 144         struct ldb_message *msg;
 145         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 146         char *dn_string;
 147
 148         /*
 149           - find DN of target
 150           - find DN of source
 151           - construct ldb_message
 152               - either an add or a delete
 153          */
 154         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 155         if (ret != LDB_SUCCESS) {
 156                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
 157                                        GUID_string(bl, &bl->target_guid));
 158                 talloc_free(tmp_ctx);
 159                 return ret;
 160         }
 161
 162         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 163         if (ret != LDB_SUCCESS) {
 164                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 165                                        GUID_string(bl, &bl->forward_guid));
 166                 talloc_free(tmp_ctx);
 167                 return ret;
 168         }
 169
 170         msg = ldb_msg_new(tmp_ctx);
 171         if (msg == NULL) {
 172                 ldb_module_oom(module);
 173                 talloc_free(tmp_ctx);
 174                 return LDB_ERR_OPERATIONS_ERROR;
 175         }
 176
 177         /* construct a ldb_message for adding/deleting the backlink */
 178         msg->dn = target_dn;
 179         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 180         if (!dn_string) {
 181                 ldb_module_oom(module);
 182                 talloc_free(tmp_ctx);
 183                 return LDB_ERR_OPERATIONS_ERROR;
 184         }
 185         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 186         if (ret != LDB_SUCCESS) {
 187                 talloc_free(tmp_ctx);
 188                 return ret;
 189         }
 190         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 191
 192         ret = dsdb_module_modify(module, msg, 0);
 193         if (ret != LDB_SUCCESS) {
 194                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 195                                        bl->active?"add":"remove",
 196                                        ldb_dn_get_linearized(source_dn),
 197                                        ldb_dn_get_linearized(target_dn),
 198                                        ldb_errstring(ldb));
 199                 talloc_free(tmp_ctx);
 200                 return ret;
 201         }
 202         talloc_free(tmp_ctx);
 203         return ret;
 204 }
 205
 206 /*
 207   add a backlink to the list of backlinks to add/delete in the prepare
 208   commit
 209  */
 210 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 211                                struct GUID *forward_guid, struct GUID *target_guid,
 212                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 213 {
 214         const struct dsdb_attribute *target_attr;
 215         struct la_backlink *bl;
 216         struct replmd_private *replmd_private =
 217                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 218
 219         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID + 1);
 220         if (!target_attr) {
 221                 /*
 222                  * windows 2003 has a broken schema where the
 223                  * definition of msDS-IsDomainFor is missing (which is
 224                  * supposed to be the backlink of the
 225                  * msDS-HasDomainNCs attribute
 226                  */
 227                 return LDB_SUCCESS;
 228         }
 229
 230         /* see if its already in the list */
 231         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 232                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 233                     GUID_equal(target_guid, &bl->target_guid) &&
 234                     (target_attr->lDAPDisplayName == bl->attr_name ||
 235                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 236                         break;
 237                 }
 238         }
 239
 240         if (bl) {
 241                 /* we found an existing one */
 242                 if (bl->active == active) {
 243                         return LDB_SUCCESS;
 244                 }
 245                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 246                 talloc_free(bl);
 247                 return LDB_SUCCESS;
 248         }
 249
 250         if (replmd_private->bl_ctx == NULL) {
 251                 replmd_private->bl_ctx = talloc_new(replmd_private);
 252                 if (replmd_private->bl_ctx == NULL) {
 253                         ldb_module_oom(module);
 254                         return LDB_ERR_OPERATIONS_ERROR;
 255                 }
 256         }
 257
 258         /* its a new one */
 259         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 260         if (bl == NULL) {
 261                 ldb_module_oom(module);
 262                 return LDB_ERR_OPERATIONS_ERROR;
 263         }
 264
 265         bl->attr_name = target_attr->lDAPDisplayName;
 266         bl->forward_guid = *forward_guid;
 267         bl->target_guid = *target_guid;
 268         bl->active = active;
 269
 270         /* the caller may ask for this backlink to be processed
 271            immediately */
 272         if (immediate) {
 273                 int ret = replmd_process_backlink(module, bl);
 274                 talloc_free(bl);
 275                 return ret;
 276         }
 277
 278         DLIST_ADD(replmd_private->la_backlinks, bl);
 279
 280         return LDB_SUCCESS;
 281 }
 282
 283
 284 /*
 285  * Callback for most write operations in this module:
 286  *
 287  * notify the repl task that a object has changed. The notifies are
 288  * gathered up in the replmd_private structure then written to the
 289  * @REPLCHANGED object in each partition during the prepare_commit
 290  */
 291 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 292 {
 293         int ret;
 294         struct replmd_replicated_request *ac =
 295                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 296         struct replmd_private *replmd_private =
 297                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 298         struct nc_entry *modified_partition;
 299         struct ldb_control *partition_ctrl;
 300         const struct dsdb_control_current_partition *partition;
 301
 302         struct ldb_control **controls;
 303
 304         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 305
 306         /* Remove the 'partition' control from what we pass up the chain */
 307         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 308
 309         if (ares->error != LDB_SUCCESS) {
 310                 return ldb_module_done(ac->req, controls,
 311                                         ares->response, ares->error);
 312         }
 313
 314         if (ares->type != LDB_REPLY_DONE) {
 315                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 316                 return ldb_module_done(ac->req, NULL,
 317                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 318         }
 319
 320         if (!partition_ctrl) {
 321                 return ldb_module_done(ac->req, NULL,
 322                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 323         }
 324
 325         partition = talloc_get_type_abort(partition_ctrl->data,
 326                                     struct dsdb_control_current_partition);
 327
 328         if (ac->seq_num > 0) {
 329                 for (modified_partition = replmd_private->ncs; modified_partition;
 330                      modified_partition = modified_partition->next) {
 331                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 332                                 break;
 333                         }
 334                 }
 335
 336                 if (modified_partition == NULL) {
 337                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 338                         if (!modified_partition) {
 339                                 ldb_oom(ldb_module_get_ctx(ac->module));
 340                                 return ldb_module_done(ac->req, NULL,
 341                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 342                         }
 343                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 344                         if (!modified_partition->dn) {
 345                                 ldb_oom(ldb_module_get_ctx(ac->module));
 346                                 return ldb_module_done(ac->req, NULL,
 347                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 348                         }
 349                         DLIST_ADD(replmd_private->ncs, modified_partition);
 350                 }
 351
 352                 if (ac->seq_num > modified_partition->mod_usn) {
 353                         modified_partition->mod_usn = ac->seq_num;
 354                 }
 355         }
 356
 357         if (ac->apply_mode) {
 358                 talloc_free(ares);
 359                 ac->index_current++;
 360
 361                 ret = replmd_replicated_apply_next(ac);
 362                 if (ret != LDB_SUCCESS) {
 363                         return ldb_module_done(ac->req, NULL, NULL, ret);
 364                 }
 365                 return ret;
 366         } else {
 367                 /* free the partition control container here, for the
 368                  * common path.  Other cases will have it cleaned up
 369                  * eventually with the ares */
 370                 talloc_free(partition_ctrl);
 371                 return ldb_module_done(ac->req,
 372                                        controls_except_specified(controls, ares, partition_ctrl),
 373                                        ares->response, LDB_SUCCESS);
 374         }
 375 }
 376
 377
 378 /*
 379  * update a @REPLCHANGED record in each partition if there have been
 380  * any writes of replicated data in the partition
 381  */
 382 static int replmd_notify_store(struct ldb_module *module)
 383 {
 384         struct replmd_private *replmd_private =
 385                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 386         struct ldb_context *ldb = ldb_module_get_ctx(module);
 387
 388         while (replmd_private->ncs) {
 389                 int ret;
 390                 struct nc_entry *modified_partition = replmd_private->ncs;
 391
 392                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn, modified_partition->mod_usn);
 393                 if (ret != LDB_SUCCESS) {
 394                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 395                                  ldb_dn_get_linearized(modified_partition->dn)));
 396                         return ret;
 397                 }
 398                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 399                 talloc_free(modified_partition);
 400         }
 401
 402         return LDB_SUCCESS;
 403 }
 404
 405
 406 /*
 407   created a replmd_replicated_request context
 408  */
 409 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 410                                                          struct ldb_request *req)
 411 {
 412         struct ldb_context *ldb;
 413         struct replmd_replicated_request *ac;
 414
 415         ldb = ldb_module_get_ctx(module);
 416
 417         ac = talloc_zero(req, struct replmd_replicated_request);
 418         if (ac == NULL) {
 419                 ldb_oom(ldb);
 420                 return NULL;
 421         }
 422
 423         ac->module = module;
 424         ac->req = req;
 425
 426         ac->schema = dsdb_get_schema(ldb);
 427         if (!ac->schema) {
 428                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 429                               "replmd_modify: no dsdb_schema loaded");
 430                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 431                 return NULL;
 432         }
 433
 434         return ac;
 435 }
 436
 437 /*
 438   add a time element to a record
 439 */
 440 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 441 {
 442         struct ldb_message_element *el;
 443         char *s;
 444
 445         if (ldb_msg_find_element(msg, attr) != NULL) {
 446                 return LDB_SUCCESS;
 447         }
 448
 449         s = ldb_timestring(msg, t);
 450         if (s == NULL) {
 451                 return LDB_ERR_OPERATIONS_ERROR;
 452         }
 453
 454         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 455                 return LDB_ERR_OPERATIONS_ERROR;
 456         }
 457
 458         el = ldb_msg_find_element(msg, attr);
 459         /* always set as replace. This works because on add ops, the flag
 460            is ignored */
 461         el->flags = LDB_FLAG_MOD_REPLACE;
 462
 463         return LDB_SUCCESS;
 464 }
 465
 466 /*
 467   add a uint64_t element to a record
 468 */
 469 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 470 {
 471         struct ldb_message_element *el;
 472
 473         if (ldb_msg_find_element(msg, attr) != NULL) {
 474                 return LDB_SUCCESS;
 475         }
 476
 477         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 478                 return LDB_ERR_OPERATIONS_ERROR;
 479         }
 480
 481         el = ldb_msg_find_element(msg, attr);
 482         /* always set as replace. This works because on add ops, the flag
 483            is ignored */
 484         el->flags = LDB_FLAG_MOD_REPLACE;
 485
 486         return LDB_SUCCESS;
 487 }
 488
 489 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 490                                                    const struct replPropertyMetaData1 *m2,
 491                                                    const uint32_t *rdn_attid)
 492 {
 493         if (m1->attid == m2->attid) {
 494                 return 0;
 495         }
 496
 497         /*
 498          * the rdn attribute should be at the end!
 499          * so we need to return a value greater than zero
 500          * which means m1 is greater than m2
 501          */
 502         if (m1->attid == *rdn_attid) {
 503                 return 1;
 504         }
 505
 506         /*
 507          * the rdn attribute should be at the end!
 508          * so we need to return a value less than zero
 509          * which means m2 is greater than m1
 510          */
 511         if (m2->attid == *rdn_attid) {
 512                 return -1;
 513         }
 514
 515         return m1->attid > m2->attid ? 1 : -1;
 516 }
 517
 518 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 519                                                 const struct dsdb_schema *schema,
 520                                                 struct ldb_dn *dn)
 521 {
 522         const char *rdn_name;
 523         const struct dsdb_attribute *rdn_sa;
 524
 525         rdn_name = ldb_dn_get_rdn_name(dn);
 526         if (!rdn_name) {
 527                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 528                 return LDB_ERR_OPERATIONS_ERROR;
 529         }
 530
 531         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 532         if (rdn_sa == NULL) {
 533                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 534                 return LDB_ERR_OPERATIONS_ERROR;
 535         }
 536
 537         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 538                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 539
 540         ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
 541                   discard_const_p(void, &rdn_sa->attributeID_id),
 542                   (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
 543
 544         return LDB_SUCCESS;
 545 }
 546
 547 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 548                                                  const struct ldb_message_element *e2,
 549                                                  const struct dsdb_schema *schema)
 550 {
 551         const struct dsdb_attribute *a1;
 552         const struct dsdb_attribute *a2;
 553
 554         /*
 555          * TODO: make this faster by caching the dsdb_attribute pointer
 556          *       on the ldb_messag_element
 557          */
 558
 559         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 560         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 561
 562         /*
 563          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 564          *       in the schema
 565          */
 566         if (!a1 || !a2) {
 567                 return strcasecmp(e1->name, e2->name);
 568         }
 569         if (a1->attributeID_id == a2->attributeID_id) {
 570                 return 0;
 571         }
 572         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 573 }
 574
 575 static void replmd_ldb_message_sort(struct ldb_message *msg,
 576                                     const struct dsdb_schema *schema)
 577 {
 578         ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
 579                   discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
 580 }
 581
 582 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 583                                const struct GUID *invocation_id, uint64_t seq_num,
 584                                uint64_t local_usn, NTTIME nttime, bool deleted);
 585
 586
 587 /*
 588   fix up linked attributes in replmd_add.
 589   This involves setting up the right meta-data in extended DN
 590   components, and creating backlinks to the object
 591  */
 592 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 593                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 594                              struct GUID *guid, const struct dsdb_attribute *sa)
 595 {
 596         int i;
 597         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 598         struct ldb_context *ldb = ldb_module_get_ctx(module);
 599         struct dsdb_schema *schema = dsdb_get_schema(ldb);
 600         NTTIME now;
 601
 602         unix_to_nt_time(&now, t);
 603
 604         for (i=0; i<el->num_values; i++) {
 605                 struct ldb_val *v = &el->values[i];
 606                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 607                 struct GUID target_guid;
 608                 NTSTATUS status;
 609                 int ret;
 610
 611                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 612                                           seq_num, seq_num, now, false);
 613                 if (ret != LDB_SUCCESS) {
 614                         talloc_free(tmp_ctx);
 615                         return ret;
 616                 }
 617
 618                 /* note that the DN already has the extended
 619                    components from the extended_dn_store module */
 620                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 621                 if (!NT_STATUS_IS_OK(status)) {
 622                         talloc_free(tmp_ctx);
 623                         return LDB_ERR_OPERATIONS_ERROR;
 624                 }
 625
 626                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 627                 if (ret != LDB_SUCCESS) {
 628                         talloc_free(tmp_ctx);
 629                         return ret;
 630                 }
 631         }
 632
 633         talloc_free(tmp_ctx);
 634         return LDB_SUCCESS;
 635 }
 636
 637
 638 /*
 639   intercept add requests
 640  */
 641 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 642 {
 643         struct ldb_context *ldb;
 644         struct ldb_control *control;
 645         struct replmd_replicated_request *ac;
 646         enum ndr_err_code ndr_err;
 647         struct ldb_request *down_req;
 648         struct ldb_message *msg;
 649         const DATA_BLOB *guid_blob;
 650         struct GUID guid;
 651         struct replPropertyMetaDataBlob nmd;
 652         struct ldb_val nmd_value;
 653         const struct GUID *our_invocation_id;
 654         time_t t = time(NULL);
 655         NTTIME now;
 656         char *time_str;
 657         int ret;
 658         uint32_t i, ni=0;
 659         bool allow_add_guid = false;
 660         bool remove_current_guid = false;
 661
 662         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 663         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 664         if (control) {
 665                 allow_add_guid = 1;
 666         }
 667
 668         /* do not manipulate our control entries */
 669         if (ldb_dn_is_special(req->op.add.message->dn)) {
 670                 return ldb_next_request(module, req);
 671         }
 672
 673         ldb = ldb_module_get_ctx(module);
 674
 675         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 676
 677         ac = replmd_ctx_init(module, req);
 678         if (!ac) {
 679                 return LDB_ERR_OPERATIONS_ERROR;
 680         }
 681
 682         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 683         if ( guid_blob != NULL ) {
 684                 if( !allow_add_guid ) {
 685                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 686                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 687                         talloc_free(ac);
 688                         return LDB_ERR_UNWILLING_TO_PERFORM;
 689                 } else {
 690                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 691                         if ( !NT_STATUS_IS_OK(status)) {
 692                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 693                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 694                                 talloc_free(ac);
 695                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 696                         }
 697                         /* we remove this attribute as it can be a string and will not be treated
 698                         correctly and then we will readd it latter on in the good format*/
 699                         remove_current_guid = true;
 700                 }
 701         } else {
 702                 /* a new GUID */
 703                 guid = GUID_random();
 704         }
 705
 706         /* Get a sequence number from the backend */
 707         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 708         if (ret != LDB_SUCCESS) {
 709                 talloc_free(ac);
 710                 return ret;
 711         }
 712
 713         /* get our invocationId */
 714         our_invocation_id = samdb_ntds_invocation_id(ldb);
 715         if (!our_invocation_id) {
 716                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 717                               "replmd_add: unable to find invocationId\n");
 718                 talloc_free(ac);
 719                 return LDB_ERR_OPERATIONS_ERROR;
 720         }
 721
 722         /* we have to copy the message as the caller might have it as a const */
 723         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 724         if (msg == NULL) {
 725                 ldb_oom(ldb);
 726                 talloc_free(ac);
 727                 return LDB_ERR_OPERATIONS_ERROR;
 728         }
 729
 730         /* generated times */
 731         unix_to_nt_time(&now, t);
 732         time_str = ldb_timestring(msg, t);
 733         if (!time_str) {
 734                 ldb_oom(ldb);
 735                 talloc_free(ac);
 736                 return LDB_ERR_OPERATIONS_ERROR;
 737         }
 738         if (remove_current_guid) {
 739                 ldb_msg_remove_attr(msg,"objectGUID");
 740         }
 741
 742         /*
 743          * remove autogenerated attributes
 744          */
 745         ldb_msg_remove_attr(msg, "whenCreated");
 746         ldb_msg_remove_attr(msg, "whenChanged");
 747         ldb_msg_remove_attr(msg, "uSNCreated");
 748         ldb_msg_remove_attr(msg, "uSNChanged");
 749         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 750
 751         /*
 752          * readd replicated attributes
 753          */
 754         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 755         if (ret != LDB_SUCCESS) {
 756                 ldb_oom(ldb);
 757                 talloc_free(ac);
 758                 return ret;
 759         }
 760
 761         /* build the replication meta_data */
 762         ZERO_STRUCT(nmd);
 763         nmd.version             = 1;
 764         nmd.ctr.ctr1.count      = msg->num_elements;
 765         nmd.ctr.ctr1.array      = talloc_array(msg,
 766                                                struct replPropertyMetaData1,
 767                                                nmd.ctr.ctr1.count);
 768         if (!nmd.ctr.ctr1.array) {
 769                 ldb_oom(ldb);
 770                 talloc_free(ac);
 771                 return LDB_ERR_OPERATIONS_ERROR;
 772         }
 773
 774         for (i=0; i < msg->num_elements; i++) {
 775                 struct ldb_message_element *e = &msg->elements[i];
 776                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 777                 const struct dsdb_attribute *sa;
 778
 779                 if (e->name[0] == '@') continue;
 780
 781                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 782                 if (!sa) {
 783                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 784                                       "replmd_add: attribute '%s' not defined in schema\n",
 785                                       e->name);
 786                         talloc_free(ac);
 787                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 788                 }
 789
 790                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 791                         /* if the attribute is not replicated (0x00000001)
 792                          * or constructed (0x00000004) it has no metadata
 793                          */
 794                         continue;
 795                 }
 796
 797 #if W2K3_LINKED_ATTRIBUTES
 798                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 799                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 800                         if (ret != LDB_SUCCESS) {
 801                                 talloc_free(ac);
 802                                 return ret;
 803                         }
 804                         /* linked attributes are not stored in
 805                            replPropertyMetaData in FL above w2k */
 806                         continue;
 807                 }
 808 #endif
 809
 810                 m->attid                        = sa->attributeID_id;
 811                 m->version                      = 1;
 812                 m->originating_change_time      = now;
 813                 m->originating_invocation_id    = *our_invocation_id;
 814                 m->originating_usn              = ac->seq_num;
 815                 m->local_usn                    = ac->seq_num;
 816                 ni++;
 817         }
 818
 819         /* fix meta data count */
 820         nmd.ctr.ctr1.count = ni;
 821
 822         /*
 823          * sort meta data array, and move the rdn attribute entry to the end
 824          */
 825         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 826         if (ret != LDB_SUCCESS) {
 827                 talloc_free(ac);
 828                 return ret;
 829         }
 830
 831         /* generated NDR encoded values */
 832         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 833                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 834                                        &nmd,
 835                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 836         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 837                 ldb_oom(ldb);
 838                 talloc_free(ac);
 839                 return LDB_ERR_OPERATIONS_ERROR;
 840         }
 841
 842         /*
 843          * add the autogenerated values
 844          */
 845         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 846         if (ret != LDB_SUCCESS) {
 847                 ldb_oom(ldb);
 848                 talloc_free(ac);
 849                 return ret;
 850         }
 851         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 852         if (ret != LDB_SUCCESS) {
 853                 ldb_oom(ldb);
 854                 talloc_free(ac);
 855                 return ret;
 856         }
 857         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 858         if (ret != LDB_SUCCESS) {
 859                 ldb_oom(ldb);
 860                 talloc_free(ac);
 861                 return ret;
 862         }
 863         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 864         if (ret != LDB_SUCCESS) {
 865                 ldb_oom(ldb);
 866                 talloc_free(ac);
 867                 return ret;
 868         }
 869         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 870         if (ret != LDB_SUCCESS) {
 871                 ldb_oom(ldb);
 872                 talloc_free(ac);
 873                 return ret;
 874         }
 875
 876         /*
 877          * sort the attributes by attid before storing the object
 878          */
 879         replmd_ldb_message_sort(msg, ac->schema);
 880
 881         ret = ldb_build_add_req(&down_req, ldb, ac,
 882                                 msg,
 883                                 req->controls,
 884                                 ac, replmd_op_callback,
 885                                 req);
 886         if (ret != LDB_SUCCESS) {
 887                 talloc_free(ac);
 888                 return ret;
 889         }
 890
 891         /* mark the control done */
 892         if (control) {
 893                 control->critical = 0;
 894         }
 895
 896         /* go on with the call chain */
 897         return ldb_next_request(module, down_req);
 898 }
 899
 900
 901 /*
 902  * update the replPropertyMetaData for one element
 903  */
 904 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 905                                       struct ldb_message *msg,
 906                                       struct ldb_message_element *el,
 907                                       struct replPropertyMetaDataBlob *omd,
 908                                       const struct dsdb_schema *schema,
 909                                       uint64_t *seq_num,
 910                                       const struct GUID *our_invocation_id,
 911                                       NTTIME now)
 912 {
 913         int i;
 914         const struct dsdb_attribute *a;
 915         struct replPropertyMetaData1 *md1;
 916
 917         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 918         if (a == NULL) {
 919                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
 920                          el->name));
 921                 return LDB_ERR_OPERATIONS_ERROR;
 922         }
 923
 924         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 925                 return LDB_SUCCESS;
 926         }
 927
 928         for (i=0; i<omd->ctr.ctr1.count; i++) {
 929                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
 930         }
 931
 932 #if W2K3_LINKED_ATTRIBUTES
 933         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 934                 /* linked attributes are not stored in
 935                    replPropertyMetaData in FL above w2k, but we do
 936                    raise the seqnum for the object  */
 937                 if (*seq_num == 0 &&
 938                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
 939                         return LDB_ERR_OPERATIONS_ERROR;
 940                 }
 941                 return LDB_SUCCESS;
 942         }
 943 #endif
 944
 945         if (i == omd->ctr.ctr1.count) {
 946                 /* we need to add a new one */
 947                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
 948                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
 949                 if (omd->ctr.ctr1.array == NULL) {
 950                         ldb_oom(ldb);
 951                         return LDB_ERR_OPERATIONS_ERROR;
 952                 }
 953                 omd->ctr.ctr1.count++;
 954                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
 955         }
 956
 957         /* Get a new sequence number from the backend. We only do this
 958          * if we have a change that requires a new
 959          * replPropertyMetaData element
 960          */
 961         if (*seq_num == 0) {
 962                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
 963                 if (ret != LDB_SUCCESS) {
 964                         return LDB_ERR_OPERATIONS_ERROR;
 965                 }
 966         }
 967
 968         md1 = &omd->ctr.ctr1.array[i];
 969         md1->version++;
 970         md1->attid                     = a->attributeID_id;
 971         md1->originating_change_time   = now;
 972         md1->originating_invocation_id = *our_invocation_id;
 973         md1->originating_usn           = *seq_num;
 974         md1->local_usn                 = *seq_num;
 975
 976         return LDB_SUCCESS;
 977 }
 978
 979 /*
 980  * update the replPropertyMetaData object each time we modify an
 981  * object. This is needed for DRS replication, as the merge on the
 982  * client is based on this object
 983  */
 984 static int replmd_update_rpmd(struct ldb_module *module,
 985                               const struct dsdb_schema *schema,
 986                               struct ldb_message *msg, uint64_t *seq_num,
 987                               time_t t)
 988 {
 989         const struct ldb_val *omd_value;
 990         enum ndr_err_code ndr_err;
 991         struct replPropertyMetaDataBlob omd;
 992         int i;
 993         NTTIME now;
 994         const struct GUID *our_invocation_id;
 995         int ret;
 996         const char *attrs[] = { "replPropertyMetaData" , NULL };
 997         struct ldb_result *res;
 998         struct ldb_context *ldb;
 999
1000         ldb = ldb_module_get_ctx(module);
1001
1002         our_invocation_id = samdb_ntds_invocation_id(ldb);
1003         if (!our_invocation_id) {
1004                 /* this happens during an initial vampire while
1005                    updating the schema */
1006                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1007                 return LDB_SUCCESS;
1008         }
1009
1010         unix_to_nt_time(&now, t);
1011
1012         /* search for the existing replPropertyMetaDataBlob */
1013         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, attrs);
1014         if (ret != LDB_SUCCESS || res->count != 1) {
1015                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1016                          ldb_dn_get_linearized(msg->dn)));
1017                 return LDB_ERR_OPERATIONS_ERROR;
1018         }
1019
1020
1021         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1022         if (!omd_value) {
1023                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1024                          ldb_dn_get_linearized(msg->dn)));
1025                 return LDB_ERR_OPERATIONS_ERROR;
1026         }
1027
1028         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1029                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1030                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1031         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1032                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1033                          ldb_dn_get_linearized(msg->dn)));
1034                 return LDB_ERR_OPERATIONS_ERROR;
1035         }
1036
1037         if (omd.version != 1) {
1038                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1039                          omd.version, ldb_dn_get_linearized(msg->dn)));
1040                 return LDB_ERR_OPERATIONS_ERROR;
1041         }
1042
1043         for (i=0; i<msg->num_elements; i++) {
1044                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num,
1045                                                  our_invocation_id, now);
1046                 if (ret != LDB_SUCCESS) {
1047                         return ret;
1048                 }
1049         }
1050
1051         /*
1052          * replmd_update_rpmd_element has done an update if the
1053          * seq_num is set
1054          */
1055         if (*seq_num != 0) {
1056                 struct ldb_val *md_value;
1057                 struct ldb_message_element *el;
1058
1059                 md_value = talloc(msg, struct ldb_val);
1060                 if (md_value == NULL) {
1061                         ldb_oom(ldb);
1062                         return LDB_ERR_OPERATIONS_ERROR;
1063                 }
1064
1065                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1066                 if (ret != LDB_SUCCESS) {
1067                         return ret;
1068                 }
1069
1070                 ndr_err = ndr_push_struct_blob(md_value, msg,
1071                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1072                                                &omd,
1073                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1074                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1075                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1076                                  ldb_dn_get_linearized(msg->dn)));
1077                         return LDB_ERR_OPERATIONS_ERROR;
1078                 }
1079
1080                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1081                 if (ret != LDB_SUCCESS) {
1082                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1083                                  ldb_dn_get_linearized(msg->dn)));
1084                         return ret;
1085                 }
1086
1087                 el->num_values = 1;
1088                 el->values = md_value;
1089         }
1090
1091         return LDB_SUCCESS;
1092 }
1093
1094
1095 struct parsed_dn {
1096         struct dsdb_dn *dsdb_dn;
1097         struct GUID *guid;
1098         struct ldb_val *v;
1099 };
1100
1101 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1102 {
1103         return GUID_compare(pdn1->guid, pdn2->guid);
1104 }
1105
1106 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid)
1107 {
1108         struct parsed_dn *ret;
1109         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1110         return ret;
1111 }
1112
1113 /*
1114   get a series of message element values as an array of DNs and GUIDs
1115   the result is sorted by GUID
1116  */
1117 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1118                           struct ldb_message_element *el, struct parsed_dn **pdn,
1119                           const char *ldap_oid)
1120 {
1121         int i;
1122         struct ldb_context *ldb = ldb_module_get_ctx(module);
1123
1124         if (el == NULL) {
1125                 *pdn = NULL;
1126                 return LDB_SUCCESS;
1127         }
1128
1129         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1130         if (!*pdn) {
1131                 ldb_module_oom(module);
1132                 return LDB_ERR_OPERATIONS_ERROR;
1133         }
1134
1135         for (i=0; i<el->num_values; i++) {
1136                 struct ldb_val *v = &el->values[i];
1137                 NTSTATUS status;
1138                 struct ldb_dn *dn;
1139                 struct parsed_dn *p;
1140
1141                 p = &(*pdn)[i];
1142
1143                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1144                 if (p->dsdb_dn == NULL) {
1145                         return LDB_ERR_INVALID_DN_SYNTAX;
1146                 }
1147
1148                 dn = p->dsdb_dn->dn;
1149
1150                 p->guid = talloc(*pdn, struct GUID);
1151                 if (p->guid == NULL) {
1152                         ldb_module_oom(module);
1153                         return LDB_ERR_OPERATIONS_ERROR;
1154                 }
1155
1156                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1157                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1158                         /* we got a DN without a GUID - go find the GUID */
1159                         int ret = dsdb_find_guid_by_dn(ldb, dn, p->guid);
1160                         if (ret != LDB_SUCCESS) {
1161                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1162                                                        ldb_dn_get_linearized(dn));
1163                                 return ret;
1164                         }
1165                 } else if (!NT_STATUS_IS_OK(status)) {
1166                         return LDB_ERR_OPERATIONS_ERROR;
1167                 }
1168
1169                 /* keep a pointer to the original ldb_val */
1170                 p->v = v;
1171         }
1172
1173         qsort(*pdn, el->num_values, sizeof((*pdn)[0]), (comparison_fn_t)parsed_dn_compare);
1174
1175         return LDB_SUCCESS;
1176 }
1177
1178 /*
1179   build a new extended DN, including all meta data fields
1180
1181   DELETED             = 1 or missing
1182   RMD_ADDTIME         = originating_add_time
1183   RMD_INVOCID         = originating_invocation_id
1184   RMD_CHANGETIME      = originating_change_time
1185   RMD_ORIGINATING_USN = originating_usn
1186   RMD_LOCAL_USN       = local_usn
1187   RMD_VERSION         = version
1188  */
1189 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1190                                const struct GUID *invocation_id, uint64_t seq_num,
1191                                uint64_t local_usn, NTTIME nttime, bool deleted)
1192 {
1193         struct ldb_dn *dn = dsdb_dn->dn;
1194         const char *tstring, *usn_string;
1195         struct ldb_val tval;
1196         struct ldb_val iid;
1197         struct ldb_val usnv, local_usnv;
1198         struct ldb_val vers;
1199         NTSTATUS status;
1200         int ret;
1201         const char *dnstring;
1202
1203         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1204         if (!tstring) {
1205                 return LDB_ERR_OPERATIONS_ERROR;
1206         }
1207         tval = data_blob_string_const(tstring);
1208
1209         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1210         if (!usn_string) {
1211                 return LDB_ERR_OPERATIONS_ERROR;
1212         }
1213         usnv = data_blob_string_const(usn_string);
1214
1215         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1216         if (!usn_string) {
1217                 return LDB_ERR_OPERATIONS_ERROR;
1218         }
1219         local_usnv = data_blob_string_const(usn_string);
1220
1221         vers = data_blob_string_const("0");
1222
1223         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1224         if (!NT_STATUS_IS_OK(status)) {
1225                 return LDB_ERR_OPERATIONS_ERROR;
1226         }
1227
1228         if (deleted) {
1229                 struct ldb_val dv;
1230                 dv = data_blob_string_const("1");
1231                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1232         } else {
1233                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1234         }
1235         if (ret != LDB_SUCCESS) return ret;
1236         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1237         if (ret != LDB_SUCCESS) return ret;
1238         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1239         if (ret != LDB_SUCCESS) return ret;
1240         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1241         if (ret != LDB_SUCCESS) return ret;
1242         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1243         if (ret != LDB_SUCCESS) return ret;
1244         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1245         if (ret != LDB_SUCCESS) return ret;
1246         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1247         if (ret != LDB_SUCCESS) return ret;
1248
1249         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1250         if (dnstring == NULL) {
1251                 return LDB_ERR_OPERATIONS_ERROR;
1252         }
1253         *v = data_blob_string_const(dnstring);
1254
1255         return LDB_SUCCESS;
1256 }
1257
1258
1259 /*
1260   update an extended DN, including all meta data fields
1261
1262   see replmd_build_la_val for value names
1263  */
1264 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1265                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1266                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime, bool deleted)
1267 {
1268         struct ldb_dn *dn = dsdb_dn->dn;
1269         const char *tstring, *usn_string;
1270         struct ldb_val tval;
1271         struct ldb_val iid;
1272         struct ldb_val usnv, local_usnv;
1273         struct ldb_val vers;
1274         const struct ldb_val *old_addtime, *old_version;
1275         NTSTATUS status;
1276         int ret;
1277         const char *dnstring;
1278
1279         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1280         if (!tstring) {
1281                 return LDB_ERR_OPERATIONS_ERROR;
1282         }
1283         tval = data_blob_string_const(tstring);
1284
1285         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1286         if (!usn_string) {
1287                 return LDB_ERR_OPERATIONS_ERROR;
1288         }
1289         usnv = data_blob_string_const(usn_string);
1290
1291         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1292         if (!usn_string) {
1293                 return LDB_ERR_OPERATIONS_ERROR;
1294         }
1295         local_usnv = data_blob_string_const(usn_string);
1296
1297         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1298         if (!NT_STATUS_IS_OK(status)) {
1299                 return LDB_ERR_OPERATIONS_ERROR;
1300         }
1301
1302         if (deleted) {
1303                 struct ldb_val dv;
1304                 dv = data_blob_string_const("1");
1305                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1306         } else {
1307                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1308         }
1309         if (ret != LDB_SUCCESS) return ret;
1310
1311         /* get the ADDTIME from the original */
1312         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1313         if (old_addtime == NULL) {
1314                 old_addtime = &tval;
1315         }
1316         if (dsdb_dn != old_dsdb_dn) {
1317                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1318                 if (ret != LDB_SUCCESS) return ret;
1319         }
1320
1321         /* use our invocation id */
1322         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1323         if (ret != LDB_SUCCESS) return ret;
1324
1325         /* changetime is the current time */
1326         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1327         if (ret != LDB_SUCCESS) return ret;
1328
1329         /* update the USN */
1330         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1331         if (ret != LDB_SUCCESS) return ret;
1332
1333         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1334         if (ret != LDB_SUCCESS) return ret;
1335
1336         /* increase the version by 1 */
1337         old_version = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_VERSION");
1338         if (old_version == NULL) {
1339                 vers = data_blob_string_const("0");
1340         } else {
1341                 char *vstring;
1342                 vstring = talloc_strndup(dn, (const char *)old_version->data, old_version->length);
1343                 if (!vstring) {
1344                         return LDB_ERR_OPERATIONS_ERROR;
1345                 }
1346                 vstring = talloc_asprintf(dn, "%lu",
1347                                           (unsigned long)strtoul(vstring, NULL, 0)+1);
1348                 vers = data_blob_string_const(vstring);
1349         }
1350         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1351         if (ret != LDB_SUCCESS) return ret;
1352
1353         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1354         if (dnstring == NULL) {
1355                 return LDB_ERR_OPERATIONS_ERROR;
1356         }
1357         *v = data_blob_string_const(dnstring);
1358
1359         return LDB_SUCCESS;
1360 }
1361
1362 /*
1363   handle adding a linked attribute
1364  */
1365 static int replmd_modify_la_add(struct ldb_module *module,
1366                                 struct dsdb_schema *schema,
1367                                 struct ldb_message *msg,
1368                                 struct ldb_message_element *el,
1369                                 struct ldb_message_element *old_el,
1370                                 const struct dsdb_attribute *schema_attr,
1371                                 uint64_t seq_num,
1372                                 time_t t,
1373                                 struct GUID *msg_guid)
1374 {
1375         int i;
1376         struct parsed_dn *dns, *old_dns;
1377         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1378         int ret;
1379         struct ldb_val *new_values = NULL;
1380         unsigned int num_new_values = 0;
1381         unsigned old_num_values = old_el?old_el->num_values:0;
1382         const struct GUID *invocation_id;
1383         struct ldb_context *ldb = ldb_module_get_ctx(module);
1384         NTTIME now;
1385
1386         unix_to_nt_time(&now, t);
1387
1388         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1389         if (ret != LDB_SUCCESS) {
1390                 talloc_free(tmp_ctx);
1391                 return ret;
1392         }
1393
1394         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1395         if (ret != LDB_SUCCESS) {
1396                 talloc_free(tmp_ctx);
1397                 return ret;
1398         }
1399
1400         invocation_id = samdb_ntds_invocation_id(ldb);
1401         if (!invocation_id) {
1402                 return LDB_ERR_OPERATIONS_ERROR;
1403         }
1404
1405         /* for each new value, see if it exists already with the same GUID */
1406         for (i=0; i<el->num_values; i++) {
1407                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid);
1408                 if (p == NULL) {
1409                         /* this is a new linked attribute value */
1410                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1411                         if (new_values == NULL) {
1412                                 ldb_module_oom(module);
1413                                 talloc_free(tmp_ctx);
1414                                 return LDB_ERR_OPERATIONS_ERROR;
1415                         }
1416                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1417                                                   invocation_id, seq_num, seq_num, now, false);
1418                         if (ret != LDB_SUCCESS) {
1419                                 talloc_free(tmp_ctx);
1420                                 return ret;
1421                         }
1422                         num_new_values++;
1423                 } else {
1424                         /* this is only allowed if the GUID was
1425                            previously deleted. */
1426                         const struct ldb_val *v;
1427                         v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1428                         if (v == NULL) {
1429                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1430                                                        el->name, GUID_string(tmp_ctx, p->guid));
1431                                 talloc_free(tmp_ctx);
1432                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1433                         }
1434                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1435                                                    invocation_id, seq_num, seq_num, now, false);
1436                         if (ret != LDB_SUCCESS) {
1437                                 talloc_free(tmp_ctx);
1438                                 return ret;
1439                         }
1440                 }
1441
1442                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1443                 if (ret != LDB_SUCCESS) {
1444                         talloc_free(tmp_ctx);
1445                         return ret;
1446                 }
1447         }
1448
1449         /* add the new ones on to the end of the old values, constructing a new el->values */
1450         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1451                                     struct ldb_val,
1452                                     old_num_values+num_new_values);
1453         if (el->values == NULL) {
1454                 ldb_module_oom(module);
1455                 return LDB_ERR_OPERATIONS_ERROR;
1456         }
1457
1458         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1459         el->num_values = old_num_values + num_new_values;
1460
1461         talloc_steal(msg->elements, el->values);
1462         talloc_steal(el->values, new_values);
1463
1464         talloc_free(tmp_ctx);
1465
1466         /* we now tell the backend to replace all existing values
1467            with the one we have constructed */
1468         el->flags = LDB_FLAG_MOD_REPLACE;
1469
1470         return LDB_SUCCESS;
1471 }
1472
1473
1474 /*
1475   handle deleting all active linked attributes
1476  */
1477 static int replmd_modify_la_delete(struct ldb_module *module,
1478                                    struct dsdb_schema *schema,
1479                                    struct ldb_message *msg,
1480                                    struct ldb_message_element *el,
1481                                    struct ldb_message_element *old_el,
1482                                    const struct dsdb_attribute *schema_attr,
1483                                    uint64_t seq_num,
1484                                    time_t t,
1485                                    struct GUID *msg_guid)
1486 {
1487         int i;
1488         struct parsed_dn *dns, *old_dns;
1489         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1490         int ret;
1491         const struct GUID *invocation_id;
1492         struct ldb_context *ldb = ldb_module_get_ctx(module);
1493         NTTIME now;
1494
1495         unix_to_nt_time(&now, t);
1496
1497         /* check if there is nothing to delete */
1498         if ((!old_el || old_el->num_values == 0) &&
1499             el->num_values == 0) {
1500                 return LDB_SUCCESS;
1501         }
1502
1503         if (!old_el || old_el->num_values == 0) {
1504                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1505         }
1506
1507         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1508         if (ret != LDB_SUCCESS) {
1509                 talloc_free(tmp_ctx);
1510                 return ret;
1511         }
1512
1513         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1514         if (ret != LDB_SUCCESS) {
1515                 talloc_free(tmp_ctx);
1516                 return ret;
1517         }
1518
1519         invocation_id = samdb_ntds_invocation_id(ldb);
1520         if (!invocation_id) {
1521                 return LDB_ERR_OPERATIONS_ERROR;
1522         }
1523
1524         el->values = NULL;
1525
1526         /* see if we are being asked to delete any links that
1527            don't exist or are already deleted */
1528         for (i=0; i<el->num_values; i++) {
1529                 struct parsed_dn *p = &dns[i];
1530                 struct parsed_dn *p2;
1531                 const struct ldb_val *v;
1532
1533                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid);
1534                 if (!p2) {
1535                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1536                                                el->name, GUID_string(tmp_ctx, p->guid));
1537                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1538                 }
1539                 v = ldb_dn_get_extended_component(p2->dsdb_dn->dn, "DELETED");
1540                 if (v) {
1541                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1542                                                el->name, GUID_string(tmp_ctx, p->guid));
1543                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1544                 }
1545         }
1546
1547         /* for each new value, see if it exists already with the same GUID
1548            if it is not already deleted and matches the delete list then delete it
1549         */
1550         for (i=0; i<old_el->num_values; i++) {
1551                 struct parsed_dn *p = &old_dns[i];
1552                 const struct ldb_val *v;
1553
1554                 if (dns && parsed_dn_find(dns, el->num_values, p->guid) == NULL) {
1555                         continue;
1556                 }
1557
1558                 v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1559                 if (v != NULL) continue;
1560
1561                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1562                                            invocation_id, seq_num, seq_num, now, true);
1563                 if (ret != LDB_SUCCESS) {
1564                         talloc_free(tmp_ctx);
1565                         return ret;
1566                 }
1567
1568                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1569                 if (ret != LDB_SUCCESS) {
1570                         talloc_free(tmp_ctx);
1571                         return ret;
1572                 }
1573         }
1574
1575         el->values = talloc_steal(msg->elements, old_el->values);
1576         el->num_values = old_el->num_values;
1577
1578         talloc_free(tmp_ctx);
1579
1580         /* we now tell the backend to replace all existing values
1581            with the one we have constructed */
1582         el->flags = LDB_FLAG_MOD_REPLACE;
1583
1584         return LDB_SUCCESS;
1585 }
1586
1587 /*
1588   handle replacing a linked attribute
1589  */
1590 static int replmd_modify_la_replace(struct ldb_module *module,
1591                                     struct dsdb_schema *schema,
1592                                     struct ldb_message *msg,
1593                                     struct ldb_message_element *el,
1594                                     struct ldb_message_element *old_el,
1595                                     const struct dsdb_attribute *schema_attr,
1596                                     uint64_t seq_num,
1597                                     time_t t,
1598                                     struct GUID *msg_guid)
1599 {
1600         int i;
1601         struct parsed_dn *dns, *old_dns;
1602         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1603         int ret;
1604         const struct GUID *invocation_id;
1605         struct ldb_context *ldb = ldb_module_get_ctx(module);
1606         struct ldb_val *new_values = NULL;
1607         uint32_t num_new_values = 0;
1608         unsigned old_num_values = old_el?old_el->num_values:0;
1609         NTTIME now;
1610
1611         unix_to_nt_time(&now, t);
1612
1613         /* check if there is nothing to replace */
1614         if ((!old_el || old_el->num_values == 0) &&
1615             el->num_values == 0) {
1616                 return LDB_SUCCESS;
1617         }
1618
1619         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1620         if (ret != LDB_SUCCESS) {
1621                 talloc_free(tmp_ctx);
1622                 return ret;
1623         }
1624
1625         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1626         if (ret != LDB_SUCCESS) {
1627                 talloc_free(tmp_ctx);
1628                 return ret;
1629         }
1630
1631         invocation_id = samdb_ntds_invocation_id(ldb);
1632         if (!invocation_id) {
1633                 return LDB_ERR_OPERATIONS_ERROR;
1634         }
1635
1636         /* mark all the old ones as deleted */
1637         for (i=0; i<old_num_values; i++) {
1638                 struct parsed_dn *old_p = &old_dns[i];
1639                 struct parsed_dn *p;
1640                 const struct ldb_val *v;
1641
1642                 v = ldb_dn_get_extended_component(old_p->dsdb_dn->dn, "DELETED");
1643                 if (v) continue;
1644
1645                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1646                 if (ret != LDB_SUCCESS) {
1647                         talloc_free(tmp_ctx);
1648                         return ret;
1649                 }
1650
1651                 p = parsed_dn_find(dns, el->num_values, old_p->guid);
1652                 if (p) {
1653                         /* we don't delete it if we are re-adding it */
1654                         continue;
1655                 }
1656
1657                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1658                                            invocation_id, seq_num, seq_num, now, true);
1659                 if (ret != LDB_SUCCESS) {
1660                         talloc_free(tmp_ctx);
1661                         return ret;
1662                 }
1663         }
1664
1665         /* for each new value, either update its meta-data, or add it
1666          * to old_el
1667         */
1668         for (i=0; i<el->num_values; i++) {
1669                 struct parsed_dn *p = &dns[i], *old_p;
1670
1671                 if (old_dns &&
1672                     (old_p = parsed_dn_find(old_dns,
1673                                             old_num_values, p->guid)) != NULL) {
1674                         /* update in place */
1675                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1676                                                    old_p->dsdb_dn, invocation_id,
1677                                                    seq_num, seq_num, now, false);
1678                         if (ret != LDB_SUCCESS) {
1679                                 talloc_free(tmp_ctx);
1680                                 return ret;
1681                         }
1682                 } else {
1683                         /* add a new one */
1684                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1685                                                     num_new_values+1);
1686                         if (new_values == NULL) {
1687                                 ldb_module_oom(module);
1688                                 talloc_free(tmp_ctx);
1689                                 return LDB_ERR_OPERATIONS_ERROR;
1690                         }
1691                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1692                                                   invocation_id, seq_num, seq_num, now, false);
1693                         if (ret != LDB_SUCCESS) {
1694                                 talloc_free(tmp_ctx);
1695                                 return ret;
1696                         }
1697                         num_new_values++;
1698                 }
1699
1700                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1701                 if (ret != LDB_SUCCESS) {
1702                         talloc_free(tmp_ctx);
1703                         return ret;
1704                 }
1705         }
1706
1707         /* add the new values to the end of old_el */
1708         if (num_new_values != 0) {
1709                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1710                                             struct ldb_val, old_num_values+num_new_values);
1711                 if (el->values == NULL) {
1712                         ldb_module_oom(module);
1713                         return LDB_ERR_OPERATIONS_ERROR;
1714                 }
1715                 memcpy(&el->values[old_num_values], &new_values[0],
1716                        sizeof(struct ldb_val)*num_new_values);
1717                 el->num_values = old_num_values + num_new_values;
1718                 talloc_steal(msg->elements, new_values);
1719         } else {
1720                 el->values = old_el->values;
1721                 el->num_values = old_el->num_values;
1722                 talloc_steal(msg->elements, el->values);
1723         }
1724
1725         talloc_free(tmp_ctx);
1726
1727         /* we now tell the backend to replace all existing values
1728            with the one we have constructed */
1729         el->flags = LDB_FLAG_MOD_REPLACE;
1730
1731         return LDB_SUCCESS;
1732 }
1733
1734
1735 /*
1736   handle linked attributes in modify requests
1737  */
1738 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1739                                                struct ldb_message *msg,
1740                                                uint64_t seq_num, time_t t)
1741 {
1742         struct ldb_result *res;
1743         int ret, i;
1744         struct ldb_context *ldb = ldb_module_get_ctx(module);
1745         struct ldb_message *old_msg;
1746         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1747         struct GUID old_guid;
1748
1749         if (seq_num == 0) {
1750                 /* there the replmd_update_rpmd code has already
1751                  * checked and saw that there are no linked
1752                  * attributes */
1753                 return LDB_SUCCESS;
1754         }
1755
1756 #if !W2K3_LINKED_ATTRIBUTES
1757         return LDB_SUCCESS;
1758 #endif
1759
1760         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1761                 /* don't do anything special for linked attributes */
1762                 return LDB_SUCCESS;
1763         }
1764
1765         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1766                                     DSDB_SEARCH_SHOW_DELETED |
1767                                     DSDB_SEARCH_REVEAL_INTERNALS |
1768                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1769         if (ret != LDB_SUCCESS) {
1770                 return ret;
1771         }
1772         old_msg = res->msgs[0];
1773
1774         old_guid = samdb_result_guid(old_msg, "objectGUID");
1775
1776         for (i=0; i<msg->num_elements; i++) {
1777                 struct ldb_message_element *el = &msg->elements[i];
1778                 struct ldb_message_element *old_el, *new_el;
1779                 const struct dsdb_attribute *schema_attr
1780                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1781                 if (!schema_attr) {
1782                         ldb_asprintf_errstring(ldb,
1783                                                "attribute %s is not a valid attribute in schema", el->name);
1784                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1785                 }
1786                 if (schema_attr->linkID == 0) {
1787                         continue;
1788                 }
1789                 if ((schema_attr->linkID & 1) == 1) {
1790                         /* Odd is for the target.  Illegal to modify */
1791                         ldb_asprintf_errstring(ldb,
1792                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1793                         return LDB_ERR_UNWILLING_TO_PERFORM;
1794                 }
1795                 old_el = ldb_msg_find_element(old_msg, el->name);
1796                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1797                 case LDB_FLAG_MOD_REPLACE:
1798                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1799                         break;
1800                 case LDB_FLAG_MOD_DELETE:
1801                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1802                         break;
1803                 case LDB_FLAG_MOD_ADD:
1804                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1805                         break;
1806                 default:
1807                         ldb_asprintf_errstring(ldb,
1808                                                "invalid flags 0x%x for %s linked attribute",
1809                                                el->flags, el->name);
1810                         return LDB_ERR_UNWILLING_TO_PERFORM;
1811                 }
1812                 if (ret != LDB_SUCCESS) {
1813                         return ret;
1814                 }
1815                 if (old_el) {
1816                         ldb_msg_remove_attr(old_msg, el->name);
1817                 }
1818                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
1819                 new_el->num_values = el->num_values;
1820                 new_el->values = el->values;
1821
1822                 /* TODO: this relises a bit too heavily on the exact
1823                    behaviour of ldb_msg_find_element and
1824                    ldb_msg_remove_element */
1825                 old_el = ldb_msg_find_element(msg, el->name);
1826                 if (old_el != el) {
1827                         ldb_msg_remove_element(msg, old_el);
1828                         i--;
1829                 }
1830         }
1831
1832         talloc_free(res);
1833         return ret;
1834 }
1835
1836
1837
1838 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
1839 {
1840         struct ldb_context *ldb;
1841         struct replmd_replicated_request *ac;
1842         struct ldb_request *down_req;
1843         struct ldb_message *msg;
1844         time_t t = time(NULL);
1845         int ret;
1846
1847         /* do not manipulate our control entries */
1848         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1849                 return ldb_next_request(module, req);
1850         }
1851
1852         ldb = ldb_module_get_ctx(module);
1853
1854         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
1855
1856         ac = replmd_ctx_init(module, req);
1857         if (!ac) {
1858                 return LDB_ERR_OPERATIONS_ERROR;
1859         }
1860
1861         /* we have to copy the message as the caller might have it as a const */
1862         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1863         if (msg == NULL) {
1864                 ldb_oom(ldb);
1865                 talloc_free(ac);
1866                 return LDB_ERR_OPERATIONS_ERROR;
1867         }
1868
1869         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t);
1870         if (ret != LDB_SUCCESS) {
1871                 talloc_free(ac);
1872                 return ret;
1873         }
1874
1875         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
1876         if (ret != LDB_SUCCESS) {
1877                 talloc_free(ac);
1878                 return ret;
1879         }
1880
1881         /* TODO:
1882          * - replace the old object with the newly constructed one
1883          */
1884
1885         ret = ldb_build_mod_req(&down_req, ldb, ac,
1886                                 msg,
1887                                 req->controls,
1888                                 ac, replmd_op_callback,
1889                                 req);
1890         if (ret != LDB_SUCCESS) {
1891                 talloc_free(ac);
1892                 return ret;
1893         }
1894         talloc_steal(down_req, msg);
1895
1896         /* we only change whenChanged and uSNChanged if the seq_num
1897            has changed */
1898         if (ac->seq_num != 0) {
1899                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
1900                         talloc_free(ac);
1901                         return ret;
1902                 }
1903
1904                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
1905                         talloc_free(ac);
1906                         return ret;
1907                 }
1908         }
1909
1910         /* go on with the call chain */
1911         return ldb_next_request(module, down_req);
1912 }
1913
1914 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
1915
1916 /*
1917   handle a rename request
1918
1919   On a rename we need to do an extra ldb_modify which sets the
1920   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
1921  */
1922 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
1923 {
1924         struct ldb_context *ldb;
1925         struct replmd_replicated_request *ac;
1926         int ret;
1927         struct ldb_request *down_req;
1928
1929         /* do not manipulate our control entries */
1930         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1931                 return ldb_next_request(module, req);
1932         }
1933
1934         ldb = ldb_module_get_ctx(module);
1935
1936         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
1937
1938         ac = replmd_ctx_init(module, req);
1939         if (!ac) {
1940                 return LDB_ERR_OPERATIONS_ERROR;
1941         }
1942         ret = ldb_build_rename_req(&down_req, ldb, ac,
1943                                    ac->req->op.rename.olddn,
1944                                    ac->req->op.rename.newdn,
1945                                    ac->req->controls,
1946                                    ac, replmd_rename_callback,
1947                                    ac->req);
1948
1949         if (ret != LDB_SUCCESS) {
1950                 talloc_free(ac);
1951                 return ret;
1952         }
1953
1954         /* go on with the call chain */
1955         return ldb_next_request(module, down_req);
1956 }
1957
1958 /* After the rename is compleated, update the whenchanged etc */
1959 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
1960 {
1961         struct ldb_context *ldb;
1962         struct replmd_replicated_request *ac;
1963         struct ldb_request *down_req;
1964         struct ldb_message *msg;
1965         time_t t = time(NULL);
1966         int ret;
1967
1968         ac = talloc_get_type(req->context, struct replmd_replicated_request);
1969         ldb = ldb_module_get_ctx(ac->module);
1970
1971         if (ares->error != LDB_SUCCESS) {
1972                 return ldb_module_done(ac->req, ares->controls,
1973                                         ares->response, ares->error);
1974         }
1975
1976         if (ares->type != LDB_REPLY_DONE) {
1977                 ldb_set_errstring(ldb,
1978                                   "invalid ldb_reply_type in callback");
1979                 talloc_free(ares);
1980                 return ldb_module_done(ac->req, NULL, NULL,
1981                                         LDB_ERR_OPERATIONS_ERROR);
1982         }
1983
1984         /* Get a sequence number from the backend */
1985         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
1986         if (ret != LDB_SUCCESS) {
1987                 return ret;
1988         }
1989
1990         /* TODO:
1991          * - replace the old object with the newly constructed one
1992          */
1993
1994         msg = ldb_msg_new(ac);
1995         if (msg == NULL) {
1996                 ldb_oom(ldb);
1997                 return LDB_ERR_OPERATIONS_ERROR;
1998         }
1999
2000         msg->dn = ac->req->op.rename.newdn;
2001
2002         ret = ldb_build_mod_req(&down_req, ldb, ac,
2003                                 msg,
2004                                 req->controls,
2005                                 ac, replmd_op_callback,
2006                                 req);
2007
2008         if (ret != LDB_SUCCESS) {
2009                 talloc_free(ac);
2010                 return ret;
2011         }
2012         talloc_steal(down_req, msg);
2013
2014         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2015                 talloc_free(ac);
2016                 return ret;
2017         }
2018
2019         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2020                 talloc_free(ac);
2021                 return ret;
2022         }
2023
2024         /* go on with the call chain - do the modify after the rename */
2025         return ldb_next_request(ac->module, down_req);
2026 }
2027
2028 /* remove forwards and backlinks as needed when an object
2029    is deleted */
2030 static int replmd_delete_remove_link(struct ldb_module *module,
2031                                      struct dsdb_schema *schema,
2032                                      struct ldb_dn *dn,
2033                                      struct ldb_message_element *el,
2034                                      const struct dsdb_attribute *sa)
2035 {
2036         int i;
2037         TALLOC_CTX *tmp_ctx = talloc_new(module);
2038         struct ldb_context *ldb = ldb_module_get_ctx(module);
2039
2040         for (i=0; i<el->num_values; i++) {
2041                 struct dsdb_dn *dsdb_dn;
2042                 NTSTATUS status;
2043                 int ret;
2044                 struct GUID guid2;
2045                 struct ldb_message *msg;
2046                 const struct dsdb_attribute *target_attr;
2047                 struct ldb_message_element *el2;
2048                 struct ldb_val dn_val;
2049
2050                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2051                         continue;
2052                 }
2053
2054                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2055                 if (!dsdb_dn) {
2056                         talloc_free(tmp_ctx);
2057                         return LDB_ERR_OPERATIONS_ERROR;
2058                 }
2059
2060                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2061                 if (!NT_STATUS_IS_OK(status)) {
2062                         talloc_free(tmp_ctx);
2063                         return LDB_ERR_OPERATIONS_ERROR;
2064                 }
2065
2066                 /* remove the link */
2067                 msg = ldb_msg_new(tmp_ctx);
2068                 if (!msg) {
2069                         ldb_module_oom(module);
2070                         talloc_free(tmp_ctx);
2071                         return LDB_ERR_OPERATIONS_ERROR;
2072                 }
2073
2074
2075                 msg->dn = dsdb_dn->dn;
2076
2077                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2078                 if (target_attr == NULL) {
2079                         continue;
2080                 }
2081
2082                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2083                 if (ret != LDB_SUCCESS) {
2084                         ldb_module_oom(module);
2085                         talloc_free(tmp_ctx);
2086                         return LDB_ERR_OPERATIONS_ERROR;
2087                 }
2088                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2089                 el2->values = &dn_val;
2090                 el2->num_values = 1;
2091
2092                 ret = dsdb_module_modify(module, msg, 0);
2093                 if (ret != LDB_SUCCESS) {
2094                         talloc_free(tmp_ctx);
2095                         return ret;
2096                 }
2097         }
2098         talloc_free(tmp_ctx);
2099         return LDB_SUCCESS;
2100 }
2101
2102
2103 /*
2104   handle update of replication meta data for deletion of objects
2105
2106   This also handles the mapping of delete to a rename operation
2107   to allow deletes to be replicated.
2108  */
2109 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2110 {
2111         int ret = LDB_ERR_OTHER;
2112         bool retb;
2113         struct ldb_dn *old_dn, *new_dn;
2114         const char *rdn_name;
2115         const struct ldb_val *rdn_value, *new_rdn_value;
2116         struct GUID guid;
2117         struct ldb_context *ldb = ldb_module_get_ctx(module);
2118         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2119         struct ldb_message *msg, *old_msg;
2120         struct ldb_message_element *el;
2121         TALLOC_CTX *tmp_ctx;
2122         struct ldb_result *res, *parent_res;
2123         const char *preserved_attrs[] = {
2124                 /* yes, this really is a hard coded list. See MS-ADTS
2125                    section 3.1.1.5.5.1.1 */
2126                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2127                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2128                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2129                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2130                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2131                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2132                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreate",
2133                 NULL};
2134         uint32_t el_count = 0;
2135         int i;
2136
2137         tmp_ctx = talloc_new(ldb);
2138
2139         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2140
2141         /* we need the complete msg off disk, so we can work out which
2142            attributes need to be removed */
2143         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2144                                     DSDB_SEARCH_SHOW_DELETED |
2145                                     DSDB_SEARCH_REVEAL_INTERNALS |
2146                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2147         if (ret != LDB_SUCCESS) {
2148                 talloc_free(tmp_ctx);
2149                 return ret;
2150         }
2151         old_msg = res->msgs[0];
2152
2153         /* work out where we will be renaming this object to */
2154         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2155         if (ret != LDB_SUCCESS) {
2156                 /* this is probably an attempted delete on a partition
2157                  * that doesn't allow delete operations, such as the
2158                  * schema partition */
2159                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2160                                        ldb_dn_get_linearized(old_dn));
2161                 talloc_free(tmp_ctx);
2162                 return LDB_ERR_UNWILLING_TO_PERFORM;
2163         }
2164
2165         rdn_name = ldb_dn_get_rdn_name(old_dn);
2166         rdn_value = ldb_dn_get_rdn_val(old_dn);
2167
2168         /* get the objects GUID from the search we just did */
2169         guid = samdb_result_guid(old_msg, "objectGUID");
2170
2171         /* Add a formatted child */
2172         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2173                                     rdn_name,
2174                                     rdn_value->data,
2175                                     GUID_string(tmp_ctx, &guid));
2176         if (!retb) {
2177                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2178                                 ldb_dn_get_linearized(new_dn)));
2179                 talloc_free(tmp_ctx);
2180                 return LDB_ERR_OPERATIONS_ERROR;
2181         }
2182
2183         /*
2184           now we need to modify the object in the following ways:
2185
2186           - add isDeleted=TRUE
2187           - update rDN and name, with new rDN
2188           - remove linked attributes
2189           - remove objectCategory and sAMAccountType
2190           - remove attribs not on the preserved list
2191              - preserved if in above list, or is rDN
2192           - remove all linked attribs from this object
2193           - remove all links from other objects to this object
2194           - add lastKnownParent
2195           - update replPropertyMetaData?
2196
2197           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2198          */
2199
2200         msg = ldb_msg_new(tmp_ctx);
2201         if (msg == NULL) {
2202                 ldb_module_oom(module);
2203                 talloc_free(tmp_ctx);
2204                 return LDB_ERR_OPERATIONS_ERROR;
2205         }
2206
2207         msg->dn = old_dn;
2208
2209         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2210         if (ret != LDB_SUCCESS) {
2211                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2212                 ldb_module_oom(module);
2213                 talloc_free(tmp_ctx);
2214                 return ret;
2215         }
2216         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2217
2218         /* we need the storage form of the parent GUID */
2219         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2220                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2221                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2222                                     DSDB_SEARCH_REVEAL_INTERNALS);
2223         if (ret != LDB_SUCCESS) {
2224                 talloc_free(tmp_ctx);
2225                 return ret;
2226         }
2227
2228         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2229                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2230         if (ret != LDB_SUCCESS) {
2231                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2232                 ldb_module_oom(module);
2233                 talloc_free(tmp_ctx);
2234                 return ret;
2235         }
2236         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2237
2238         /* work out which of the old attributes we will be removing */
2239         for (i=0; i<old_msg->num_elements; i++) {
2240                 const struct dsdb_attribute *sa;
2241                 el = &old_msg->elements[i];
2242                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2243                 if (!sa) {
2244                         talloc_free(tmp_ctx);
2245                         return LDB_ERR_OPERATIONS_ERROR;
2246                 }
2247                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2248                         /* don't remove the rDN */
2249                         continue;
2250                 }
2251
2252                 if (sa->linkID) {
2253                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2254                         if (ret != LDB_SUCCESS) {
2255                                 talloc_free(tmp_ctx);
2256                                 return LDB_ERR_OPERATIONS_ERROR;
2257                         }
2258                 }
2259
2260                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2261                         continue;
2262                 }
2263
2264                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2265                 if (ret != LDB_SUCCESS) {
2266                         talloc_free(tmp_ctx);
2267                         ldb_module_oom(module);
2268                         return ret;
2269                 }
2270         }
2271
2272         /* work out what the new rdn value is, for updating the
2273            rDN and name fields */
2274         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2275         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2276         if (ret != LDB_SUCCESS) {
2277                 talloc_free(tmp_ctx);
2278                 return ret;
2279         }
2280         el->flags = LDB_FLAG_MOD_REPLACE;
2281
2282         el = ldb_msg_find_element(old_msg, "name");
2283         if (el) {
2284                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2285                 if (ret != LDB_SUCCESS) {
2286                         talloc_free(tmp_ctx);
2287                         return ret;
2288                 }
2289                 el->flags = LDB_FLAG_MOD_REPLACE;
2290         }
2291
2292         ret = dsdb_module_modify(module, msg, 0);
2293         if (ret != LDB_SUCCESS){
2294                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2295                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2296                 talloc_free(tmp_ctx);
2297                 return ret;
2298         }
2299
2300         /* now rename onto the new DN */
2301         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2302         if (ret != LDB_SUCCESS){
2303                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2304                          ldb_dn_get_linearized(old_dn),
2305                          ldb_dn_get_linearized(new_dn),
2306                          ldb_errstring(ldb)));
2307                 talloc_free(tmp_ctx);
2308                 return ret;
2309         }
2310
2311         talloc_free(tmp_ctx);
2312
2313         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2314 }
2315
2316
2317
2318 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2319 {
2320         return ret;
2321 }
2322
2323 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2324 {
2325         int ret = LDB_ERR_OTHER;
2326         /* TODO: do some error mapping */
2327         return ret;
2328 }
2329
2330 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2331 {
2332         struct ldb_context *ldb;
2333         struct ldb_request *change_req;
2334         enum ndr_err_code ndr_err;
2335         struct ldb_message *msg;
2336         struct replPropertyMetaDataBlob *md;
2337         struct ldb_val md_value;
2338         uint32_t i;
2339         int ret;
2340
2341         /*
2342          * TODO: check if the parent object exist
2343          */
2344
2345         /*
2346          * TODO: handle the conflict case where an object with the
2347          *       same name exist
2348          */
2349
2350         ldb = ldb_module_get_ctx(ar->module);
2351         msg = ar->objs->objects[ar->index_current].msg;
2352         md = ar->objs->objects[ar->index_current].meta_data;
2353
2354         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2355         if (ret != LDB_SUCCESS) {
2356                 return replmd_replicated_request_error(ar, ret);
2357         }
2358
2359         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2360         if (ret != LDB_SUCCESS) {
2361                 return replmd_replicated_request_error(ar, ret);
2362         }
2363
2364         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2365         if (ret != LDB_SUCCESS) {
2366                 return replmd_replicated_request_error(ar, ret);
2367         }
2368
2369         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2370         if (ret != LDB_SUCCESS) {
2371                 return replmd_replicated_request_error(ar, ret);
2372         }
2373
2374         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2375         if (ret != LDB_SUCCESS) {
2376                 return replmd_replicated_request_error(ar, ret);
2377         }
2378
2379         /* remove any message elements that have zero values */
2380         for (i=0; i<msg->num_elements; i++) {
2381                 if (msg->elements[i].num_values == 0) {
2382                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2383                                  msg->elements[i].name));
2384                         memmove(&msg->elements[i],
2385                                 &msg->elements[i+1],
2386                                 sizeof(msg->elements[i])*(msg->num_elements - (i+1)));
2387                         msg->num_elements--;
2388                         i--;
2389                 }
2390         }
2391
2392         /*
2393          * the meta data array is already sorted by the caller
2394          */
2395         for (i=0; i < md->ctr.ctr1.count; i++) {
2396                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2397         }
2398         ndr_err = ndr_push_struct_blob(&md_value, msg,
2399                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2400                                        md,
2401                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2402         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2403                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2404                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2405         }
2406         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2407         if (ret != LDB_SUCCESS) {
2408                 return replmd_replicated_request_error(ar, ret);
2409         }
2410
2411         replmd_ldb_message_sort(msg, ar->schema);
2412
2413         if (DEBUGLVL(4)) {
2414                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2415                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2416                 talloc_free(s);
2417         }
2418
2419         ret = ldb_build_add_req(&change_req,
2420                                 ldb,
2421                                 ar,
2422                                 msg,
2423                                 ar->controls,
2424                                 ar,
2425                                 replmd_op_callback,
2426                                 ar->req);
2427         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2428
2429         return ldb_next_request(ar->module, change_req);
2430 }
2431
2432 /*
2433    return true if an update is newer than an existing entry
2434    see section 5.11 of MS-ADTS
2435 */
2436 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2437                                    const struct GUID *update_invocation_id,
2438                                    uint32_t current_version,
2439                                    uint32_t update_version,
2440                                    NTTIME current_change_time,
2441                                    NTTIME update_change_time)
2442 {
2443         if (update_version != current_version) {
2444                 return update_version > current_version;
2445         }
2446         if (update_change_time > current_change_time) {
2447                 return true;
2448         }
2449         if (update_change_time == current_change_time) {
2450                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2451         }
2452         return false;
2453 }
2454
2455 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2456                                                   struct replPropertyMetaData1 *new_m)
2457 {
2458         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2459                                       &new_m->originating_invocation_id,
2460                                       cur_m->version,
2461                                       new_m->version,
2462                                       cur_m->originating_change_time,
2463                                       new_m->originating_change_time);
2464 }
2465
2466 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2467 {
2468         struct ldb_context *ldb;
2469         struct ldb_request *change_req;
2470         enum ndr_err_code ndr_err;
2471         struct ldb_message *msg;
2472         struct replPropertyMetaDataBlob *rmd;
2473         struct replPropertyMetaDataBlob omd;
2474         const struct ldb_val *omd_value;
2475         struct replPropertyMetaDataBlob nmd;
2476         struct ldb_val nmd_value;
2477         uint32_t i,j,ni=0;
2478         uint32_t removed_attrs = 0;
2479         int ret;
2480
2481         ldb = ldb_module_get_ctx(ar->module);
2482         msg = ar->objs->objects[ar->index_current].msg;
2483         rmd = ar->objs->objects[ar->index_current].meta_data;
2484         ZERO_STRUCT(omd);
2485         omd.version = 1;
2486
2487         /*
2488          * TODO: check repl data is correct after a rename
2489          */
2490         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2491                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2492                           ldb_dn_get_linearized(ar->search_msg->dn),
2493                           ldb_dn_get_linearized(msg->dn));
2494                 /* we can't use dsdb_module_rename() here as we need
2495                    the rename call to be intercepted by this module, to
2496                    allow it to process linked attribute changes */
2497                 if (ldb_rename(ldb, ar->search_msg->dn, msg->dn) != LDB_SUCCESS) {
2498                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2499                                   ldb_dn_get_linearized(ar->search_msg->dn),
2500                                   ldb_dn_get_linearized(msg->dn),
2501                                   ldb_errstring(ldb));
2502                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2503                 }
2504         }
2505
2506         /* find existing meta data */
2507         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2508         if (omd_value) {
2509                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2510                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2511                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2512                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2513                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2514                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2515                 }
2516
2517                 if (omd.version != 1) {
2518                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2519                 }
2520         }
2521
2522         ZERO_STRUCT(nmd);
2523         nmd.version = 1;
2524         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2525         nmd.ctr.ctr1.array = talloc_array(ar,
2526                                           struct replPropertyMetaData1,
2527                                           nmd.ctr.ctr1.count);
2528         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2529
2530         /* first copy the old meta data */
2531         for (i=0; i < omd.ctr.ctr1.count; i++) {
2532                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2533                 ni++;
2534         }
2535
2536         /* now merge in the new meta data */
2537         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2538                 bool found = false;
2539
2540                 for (j=0; j < ni; j++) {
2541                         bool cmp;
2542
2543                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2544                                 continue;
2545                         }
2546
2547                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2548                                                                     &rmd->ctr.ctr1.array[i]);
2549                         if (cmp) {
2550                                 /* replace the entry */
2551                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2552                                 found = true;
2553                                 break;
2554                         }
2555
2556                         DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2557                                  msg->elements[i-removed_attrs].name,
2558                                  ldb_dn_get_linearized(msg->dn),
2559                                  GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2560
2561                         /* we don't want to apply this change so remove the attribute */
2562                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2563                         removed_attrs++;
2564
2565                         found = true;
2566                         break;
2567                 }
2568
2569                 if (found) continue;
2570
2571                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2572                 ni++;
2573         }
2574
2575         /*
2576          * finally correct the size of the meta_data array
2577          */
2578         nmd.ctr.ctr1.count = ni;
2579
2580         /*
2581          * the rdn attribute (the alias for the name attribute),
2582          * 'cn' for most objects is the last entry in the meta data array
2583          * we have stored
2584          *
2585          * sort the new meta data array
2586          */
2587         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2588         if (ret != LDB_SUCCESS) {
2589                 return ret;
2590         }
2591
2592         /*
2593          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2594          */
2595         if (msg->num_elements == 0) {
2596                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2597                           ar->index_current);
2598
2599                 ar->index_current++;
2600                 return replmd_replicated_apply_next(ar);
2601         }
2602
2603         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2604                   ar->index_current, msg->num_elements);
2605
2606         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2607         if (ret != LDB_SUCCESS) {
2608                 return replmd_replicated_request_error(ar, ret);
2609         }
2610
2611         for (i=0; i<ni; i++) {
2612                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2613         }
2614
2615         /* create the meta data value */
2616         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2617                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2618                                        &nmd,
2619                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2620         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2621                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2622                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2623         }
2624
2625         /*
2626          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2627          * and replPopertyMetaData attributes
2628          */
2629         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2630         if (ret != LDB_SUCCESS) {
2631                 return replmd_replicated_request_error(ar, ret);
2632         }
2633         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2634         if (ret != LDB_SUCCESS) {
2635                 return replmd_replicated_request_error(ar, ret);
2636         }
2637         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2638         if (ret != LDB_SUCCESS) {
2639                 return replmd_replicated_request_error(ar, ret);
2640         }
2641
2642         replmd_ldb_message_sort(msg, ar->schema);
2643
2644         /* we want to replace the old values */
2645         for (i=0; i < msg->num_elements; i++) {
2646                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2647         }
2648
2649         if (DEBUGLVL(4)) {
2650                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2651                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2652                 talloc_free(s);
2653         }
2654
2655         ret = ldb_build_mod_req(&change_req,
2656                                 ldb,
2657                                 ar,
2658                                 msg,
2659                                 ar->controls,
2660                                 ar,
2661                                 replmd_op_callback,
2662                                 ar->req);
2663         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2664
2665         return ldb_next_request(ar->module, change_req);
2666 }
2667
2668 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2669                                                    struct ldb_reply *ares)
2670 {
2671         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2672                                                struct replmd_replicated_request);
2673         int ret;
2674
2675         if (!ares) {
2676                 return ldb_module_done(ar->req, NULL, NULL,
2677                                         LDB_ERR_OPERATIONS_ERROR);
2678         }
2679         if (ares->error != LDB_SUCCESS &&
2680             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2681                 return ldb_module_done(ar->req, ares->controls,
2682                                         ares->response, ares->error);
2683         }
2684
2685         switch (ares->type) {
2686         case LDB_REPLY_ENTRY:
2687                 ar->search_msg = talloc_steal(ar, ares->message);
2688                 break;
2689
2690         case LDB_REPLY_REFERRAL:
2691                 /* we ignore referrals */
2692                 break;
2693
2694         case LDB_REPLY_DONE:
2695                 if (ar->search_msg != NULL) {
2696                         ret = replmd_replicated_apply_merge(ar);
2697                 } else {
2698                         ret = replmd_replicated_apply_add(ar);
2699                 }
2700                 if (ret != LDB_SUCCESS) {
2701                         return ldb_module_done(ar->req, NULL, NULL, ret);
2702                 }
2703         }
2704
2705         talloc_free(ares);
2706         return LDB_SUCCESS;
2707 }
2708
2709 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2710
2711 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2712 {
2713         struct ldb_context *ldb;
2714         int ret;
2715         char *tmp_str;
2716         char *filter;
2717         struct ldb_request *search_req;
2718         struct ldb_search_options_control *options;
2719
2720         if (ar->index_current >= ar->objs->num_objects) {
2721                 /* done with it, go to next stage */
2722                 return replmd_replicated_uptodate_vector(ar);
2723         }
2724
2725         ldb = ldb_module_get_ctx(ar->module);
2726         ar->search_msg = NULL;
2727
2728         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2729         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2730
2731         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2732         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2733         talloc_free(tmp_str);
2734
2735         ret = ldb_build_search_req(&search_req,
2736                                    ldb,
2737                                    ar,
2738                                    NULL,
2739                                    LDB_SCOPE_SUBTREE,
2740                                    filter,
2741                                    NULL,
2742                                    NULL,
2743                                    ar,
2744                                    replmd_replicated_apply_search_callback,
2745                                    ar->req);
2746
2747         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2748         if (ret != LDB_SUCCESS) {
2749                 return ret;
2750         }
2751
2752         /* we need to cope with cross-partition links, so search for
2753            the GUID over all partitions */
2754         options = talloc(search_req, struct ldb_search_options_control);
2755         if (options == NULL) {
2756                 DEBUG(0, (__location__ ": out of memory\n"));
2757                 return LDB_ERR_OPERATIONS_ERROR;
2758         }
2759         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
2760
2761         ret = ldb_request_add_control(search_req,
2762                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
2763                                       true, options);
2764         if (ret != LDB_SUCCESS) {
2765                 return ret;
2766         }
2767
2768         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2769
2770         return ldb_next_request(ar->module, search_req);
2771 }
2772
2773 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
2774                                                       struct ldb_reply *ares)
2775 {
2776         struct ldb_context *ldb;
2777         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2778                                                struct replmd_replicated_request);
2779         ldb = ldb_module_get_ctx(ar->module);
2780
2781         if (!ares) {
2782                 return ldb_module_done(ar->req, NULL, NULL,
2783                                         LDB_ERR_OPERATIONS_ERROR);
2784         }
2785         if (ares->error != LDB_SUCCESS) {
2786                 return ldb_module_done(ar->req, ares->controls,
2787                                         ares->response, ares->error);
2788         }
2789
2790         if (ares->type != LDB_REPLY_DONE) {
2791                 ldb_set_errstring(ldb, "Invalid reply type\n!");
2792                 return ldb_module_done(ar->req, NULL, NULL,
2793                                         LDB_ERR_OPERATIONS_ERROR);
2794         }
2795
2796         talloc_free(ares);
2797
2798         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
2799 }
2800
2801 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
2802 {
2803         struct ldb_context *ldb;
2804         struct ldb_request *change_req;
2805         enum ndr_err_code ndr_err;
2806         struct ldb_message *msg;
2807         struct replUpToDateVectorBlob ouv;
2808         const struct ldb_val *ouv_value;
2809         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
2810         struct replUpToDateVectorBlob nuv;
2811         struct ldb_val nuv_value;
2812         struct ldb_message_element *nuv_el = NULL;
2813         const struct GUID *our_invocation_id;
2814         struct ldb_message_element *orf_el = NULL;
2815         struct repsFromToBlob nrf;
2816         struct ldb_val *nrf_value = NULL;
2817         struct ldb_message_element *nrf_el = NULL;
2818         uint32_t i,j,ni=0;
2819         bool found = false;
2820         time_t t = time(NULL);
2821         NTTIME now;
2822         int ret;
2823
2824         ldb = ldb_module_get_ctx(ar->module);
2825         ruv = ar->objs->uptodateness_vector;
2826         ZERO_STRUCT(ouv);
2827         ouv.version = 2;
2828         ZERO_STRUCT(nuv);
2829         nuv.version = 2;
2830
2831         unix_to_nt_time(&now, t);
2832
2833         /*
2834          * first create the new replUpToDateVector
2835          */
2836         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
2837         if (ouv_value) {
2838                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
2839                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
2840                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
2841                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2842                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2843                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2844                 }
2845
2846                 if (ouv.version != 2) {
2847                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2848                 }
2849         }
2850
2851         /*
2852          * the new uptodateness vector will at least
2853          * contain 1 entry, one for the source_dsa
2854          *
2855          * plus optional values from our old vector and the one from the source_dsa
2856          */
2857         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
2858         if (ruv) nuv.ctr.ctr2.count += ruv->count;
2859         nuv.ctr.ctr2.cursors = talloc_array(ar,
2860                                             struct drsuapi_DsReplicaCursor2,
2861                                             nuv.ctr.ctr2.count);
2862         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2863
2864         /* first copy the old vector */
2865         for (i=0; i < ouv.ctr.ctr2.count; i++) {
2866                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
2867                 ni++;
2868         }
2869
2870         /* get our invocation_id if we have one already attached to the ldb */
2871         our_invocation_id = samdb_ntds_invocation_id(ldb);
2872
2873         /* merge in the source_dsa vector is available */
2874         for (i=0; (ruv && i < ruv->count); i++) {
2875                 found = false;
2876
2877                 if (our_invocation_id &&
2878                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2879                                our_invocation_id)) {
2880                         continue;
2881                 }
2882
2883                 for (j=0; j < ni; j++) {
2884                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2885                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2886                                 continue;
2887                         }
2888
2889                         found = true;
2890
2891                         /*
2892                          * we update only the highest_usn and not the latest_sync_success time,
2893                          * because the last success stands for direct replication
2894                          */
2895                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
2896                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
2897                         }
2898                         break;
2899                 }
2900
2901                 if (found) continue;
2902
2903                 /* if it's not there yet, add it */
2904                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
2905                 ni++;
2906         }
2907
2908         /*
2909          * merge in the current highwatermark for the source_dsa
2910          */
2911         found = false;
2912         for (j=0; j < ni; j++) {
2913                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
2914                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2915                         continue;
2916                 }
2917
2918                 found = true;
2919
2920                 /*
2921                  * here we update the highest_usn and last_sync_success time
2922                  * because we're directly replicating from the source_dsa
2923                  *
2924                  * and use the tmp_highest_usn because this is what we have just applied
2925                  * to our ldb
2926                  */
2927                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2928                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
2929                 break;
2930         }
2931         if (!found) {
2932                 /*
2933                  * here we update the highest_usn and last_sync_success time
2934                  * because we're directly replicating from the source_dsa
2935                  *
2936                  * and use the tmp_highest_usn because this is what we have just applied
2937                  * to our ldb
2938                  */
2939                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
2940                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2941                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
2942                 ni++;
2943         }
2944
2945         /*
2946          * finally correct the size of the cursors array
2947          */
2948         nuv.ctr.ctr2.count = ni;
2949
2950         /*
2951          * sort the cursors
2952          */
2953         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
2954               sizeof(struct drsuapi_DsReplicaCursor2),
2955               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
2956
2957         /*
2958          * create the change ldb_message
2959          */
2960         msg = ldb_msg_new(ar);
2961         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2962         msg->dn = ar->search_msg->dn;
2963
2964         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
2965                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2966                                        &nuv,
2967                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
2968         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2969                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2970                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2971         }
2972         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
2973         if (ret != LDB_SUCCESS) {
2974                 return replmd_replicated_request_error(ar, ret);
2975         }
2976         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
2977
2978         /*
2979          * now create the new repsFrom value from the given repsFromTo1 structure
2980          */
2981         ZERO_STRUCT(nrf);
2982         nrf.version                                     = 1;
2983         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
2984         /* and fix some values... */
2985         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
2986         nrf.ctr.ctr1.last_success                       = now;
2987         nrf.ctr.ctr1.last_attempt                       = now;
2988         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
2989         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
2990
2991         /*
2992          * first see if we already have a repsFrom value for the current source dsa
2993          * if so we'll later replace this value
2994          */
2995         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
2996         if (orf_el) {
2997                 for (i=0; i < orf_el->num_values; i++) {
2998                         struct repsFromToBlob *trf;
2999
3000                         trf = talloc(ar, struct repsFromToBlob);
3001                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3002
3003                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3004                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3005                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3006                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3007                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3008                         }
3009
3010                         if (trf->version != 1) {
3011                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3012                         }
3013
3014                         /*
3015                          * we compare the source dsa objectGUID not the invocation_id
3016                          * because we want only one repsFrom value per source dsa
3017                          * and when the invocation_id of the source dsa has changed we don't need
3018                          * the old repsFrom with the old invocation_id
3019                          */
3020                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3021                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3022                                 talloc_free(trf);
3023                                 continue;
3024                         }
3025
3026                         talloc_free(trf);
3027                         nrf_value = &orf_el->values[i];
3028                         break;
3029                 }
3030
3031                 /*
3032                  * copy over all old values to the new ldb_message
3033                  */
3034                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3035                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3036                 *nrf_el = *orf_el;
3037         }
3038
3039         /*
3040          * if we haven't found an old repsFrom value for the current source dsa
3041          * we'll add a new value
3042          */
3043         if (!nrf_value) {
3044                 struct ldb_val zero_value;
3045                 ZERO_STRUCT(zero_value);
3046                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3047                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3048
3049                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3050         }
3051
3052         /* we now fill the value which is already attached to ldb_message */
3053         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3054                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3055                                        &nrf,
3056                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3057         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3058                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3059                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3060         }
3061
3062         /*
3063          * the ldb_message_element for the attribute, has all the old values and the new one
3064          * so we'll replace the whole attribute with all values
3065          */
3066         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3067
3068         if (DEBUGLVL(4)) {
3069                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3070                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3071                 talloc_free(s);
3072         }
3073
3074         /* prepare the ldb_modify() request */
3075         ret = ldb_build_mod_req(&change_req,
3076                                 ldb,
3077                                 ar,
3078                                 msg,
3079                                 ar->controls,
3080                                 ar,
3081                                 replmd_replicated_uptodate_modify_callback,
3082                                 ar->req);
3083         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3084
3085         return ldb_next_request(ar->module, change_req);
3086 }
3087
3088 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3089                                                       struct ldb_reply *ares)
3090 {
3091         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3092                                                struct replmd_replicated_request);
3093         int ret;
3094
3095         if (!ares) {
3096                 return ldb_module_done(ar->req, NULL, NULL,
3097                                         LDB_ERR_OPERATIONS_ERROR);
3098         }
3099         if (ares->error != LDB_SUCCESS &&
3100             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3101                 return ldb_module_done(ar->req, ares->controls,
3102                                         ares->response, ares->error);
3103         }
3104
3105         switch (ares->type) {
3106         case LDB_REPLY_ENTRY:
3107                 ar->search_msg = talloc_steal(ar, ares->message);
3108                 break;
3109
3110         case LDB_REPLY_REFERRAL:
3111                 /* we ignore referrals */
3112                 break;
3113
3114         case LDB_REPLY_DONE:
3115                 if (ar->search_msg == NULL) {
3116                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3117                 } else {
3118                         ret = replmd_replicated_uptodate_modify(ar);
3119                 }
3120                 if (ret != LDB_SUCCESS) {
3121                         return ldb_module_done(ar->req, NULL, NULL, ret);
3122                 }
3123         }
3124
3125         talloc_free(ares);
3126         return LDB_SUCCESS;
3127 }
3128
3129
3130 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3131 {
3132         struct ldb_context *ldb;
3133         int ret;
3134         static const char *attrs[] = {
3135                 "replUpToDateVector",
3136                 "repsFrom",
3137                 NULL
3138         };
3139         struct ldb_request *search_req;
3140
3141         ldb = ldb_module_get_ctx(ar->module);
3142         ar->search_msg = NULL;
3143
3144         ret = ldb_build_search_req(&search_req,
3145                                    ldb,
3146                                    ar,
3147                                    ar->objs->partition_dn,
3148                                    LDB_SCOPE_BASE,
3149                                    "(objectClass=*)",
3150                                    attrs,
3151                                    NULL,
3152                                    ar,
3153                                    replmd_replicated_uptodate_search_callback,
3154                                    ar->req);
3155         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3156
3157         return ldb_next_request(ar->module, search_req);
3158 }
3159
3160
3161
3162 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3163 {
3164         struct ldb_context *ldb;
3165         struct dsdb_extended_replicated_objects *objs;
3166         struct replmd_replicated_request *ar;
3167         struct ldb_control **ctrls;
3168         int ret, i;
3169         struct replmd_private *replmd_private =
3170                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3171
3172         ldb = ldb_module_get_ctx(module);
3173
3174         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3175
3176         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3177         if (!objs) {
3178                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3179                 return LDB_ERR_PROTOCOL_ERROR;
3180         }
3181
3182         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3183                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3184                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3185                 return LDB_ERR_PROTOCOL_ERROR;
3186         }
3187
3188         ar = replmd_ctx_init(module, req);
3189         if (!ar)
3190                 return LDB_ERR_OPERATIONS_ERROR;
3191
3192         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3193         ar->apply_mode = true;
3194         ar->objs = objs;
3195         ar->schema = dsdb_get_schema(ldb);
3196         if (!ar->schema) {
3197                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3198                 talloc_free(ar);
3199                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3200                 return LDB_ERR_CONSTRAINT_VIOLATION;
3201         }
3202
3203         ctrls = req->controls;
3204
3205         if (req->controls) {
3206                 req->controls = talloc_memdup(ar, req->controls,
3207                                               talloc_get_size(req->controls));
3208                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3209         }
3210
3211         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3212         if (ret != LDB_SUCCESS) {
3213                 return ret;
3214         }
3215
3216         ar->controls = req->controls;
3217         req->controls = ctrls;
3218
3219         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3220
3221         /* save away the linked attributes for the end of the
3222            transaction */
3223         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3224                 struct la_entry *la_entry;
3225
3226                 if (replmd_private->la_ctx == NULL) {
3227                         replmd_private->la_ctx = talloc_new(replmd_private);
3228                 }
3229                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3230                 if (la_entry == NULL) {
3231                         ldb_oom(ldb);
3232                         return LDB_ERR_OPERATIONS_ERROR;
3233                 }
3234                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3235                 if (la_entry->la == NULL) {
3236                         talloc_free(la_entry);
3237                         ldb_oom(ldb);
3238                         return LDB_ERR_OPERATIONS_ERROR;
3239                 }
3240                 *la_entry->la = ar->objs->linked_attributes[i];
3241
3242                 /* we need to steal the non-scalars so they stay
3243                    around until the end of the transaction */
3244                 talloc_steal(la_entry->la, la_entry->la->identifier);
3245                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3246
3247                 DLIST_ADD(replmd_private->la_list, la_entry);
3248         }
3249
3250         return replmd_replicated_apply_next(ar);
3251 }
3252
3253 /*
3254   process one linked attribute structure
3255  */
3256 static int replmd_process_linked_attribute(struct ldb_module *module,
3257                                            struct la_entry *la_entry)
3258 {
3259         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3260         struct ldb_context *ldb = ldb_module_get_ctx(module);
3261         struct dsdb_schema *schema = dsdb_get_schema(ldb);
3262         struct ldb_message *msg;
3263         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3264         int ret;
3265         const struct dsdb_attribute *attr;
3266         struct dsdb_dn *dsdb_dn;
3267         uint64_t seq_num = 0;
3268         struct drsuapi_DsReplicaAttribute drs;
3269         struct drsuapi_DsAttributeValue val;
3270         struct ldb_message_element new_el, *old_el;
3271         WERROR status;
3272         time_t t = time(NULL);
3273         struct ldb_result *res;
3274         const char *attrs[2];
3275         struct parsed_dn *pdn_list, *pdn;
3276         struct GUID guid;
3277         NTSTATUS ntstatus;
3278         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3279
3280         drs.value_ctr.num_values = 1;
3281         drs.value_ctr.values = &val;
3282         val.blob = la->value.blob;
3283
3284 /*
3285 linked_attributes[0]:
3286      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3287         identifier               : *
3288             identifier: struct drsuapi_DsReplicaObjectIdentifier
3289                 __ndr_size               : 0x0000003a (58)
3290                 __ndr_size_sid           : 0x00000000 (0)
3291                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3292                 sid                      : S-0-0
3293                 __ndr_size_dn            : 0x00000000 (0)
3294                 dn                       : ''
3295         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3296         value: struct drsuapi_DsAttributeValue
3297             __ndr_size               : 0x0000007e (126)
3298             blob                     : *
3299                 blob                     : DATA_BLOB length=126
3300         flags                    : 0x00000001 (1)
3301                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3302         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3303         meta_data: struct drsuapi_DsReplicaMetaData
3304             version                  : 0x00000015 (21)
3305             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3306             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3307             originating_usn          : 0x000000000001e19c (123292)
3308
3309 (for cases where the link is to a normal DN)
3310      &target: struct drsuapi_DsReplicaObjectIdentifier3
3311         __ndr_size               : 0x0000007e (126)
3312         __ndr_size_sid           : 0x0000001c (28)
3313         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3314         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3315         __ndr_size_dn            : 0x00000022 (34)
3316         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3317  */
3318
3319         /* find the attribute being modified */
3320         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3321         if (attr == NULL) {
3322                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3323                 talloc_free(tmp_ctx);
3324                 return LDB_ERR_OPERATIONS_ERROR;
3325         }
3326
3327         attrs[0] = attr->lDAPDisplayName;
3328         attrs[1] = NULL;
3329
3330         /* get the existing message from the db for the object with
3331            this GUID, returning attribute being modified. We will then
3332            use this msg as the basis for a modify call */
3333         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3334                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3335                                  DSDB_SEARCH_SHOW_DELETED |
3336                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3337                                  DSDB_SEARCH_REVEAL_INTERNALS,
3338                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3339         if (ret != LDB_SUCCESS) {
3340                 talloc_free(tmp_ctx);
3341                 return ret;
3342         }
3343         if (res->count != 1) {
3344                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3345                                        GUID_string(tmp_ctx, &la->identifier->guid));
3346                 talloc_free(tmp_ctx);
3347                 return LDB_ERR_NO_SUCH_OBJECT;
3348         }
3349         msg = res->msgs[0];
3350
3351         if (msg->num_elements == 0) {
3352                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3353                 if (ret != LDB_SUCCESS) {
3354                         ldb_module_oom(module);
3355                         talloc_free(tmp_ctx);
3356                         return LDB_ERR_OPERATIONS_ERROR;
3357                 }
3358         } else {
3359                 old_el = &msg->elements[0];
3360                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3361         }
3362
3363         /* parse the existing links */
3364         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3365         if (ret != LDB_SUCCESS) {
3366                 talloc_free(tmp_ctx);
3367                 return ret;
3368         }
3369
3370         status = attr->syntax->drsuapi_to_ldb(ldb, schema, attr, &drs, tmp_ctx, &new_el);
3371         if (!W_ERROR_IS_OK(status)) {
3372                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s\n",
3373                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3374                 return LDB_ERR_OPERATIONS_ERROR;
3375         }
3376
3377         if (new_el.num_values != 1) {
3378                 ldb_asprintf_errstring(ldb, "Failed to find value in linked attribute blob for %s on %s\n",
3379                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3380                 return LDB_ERR_OPERATIONS_ERROR;
3381         }
3382
3383         dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &new_el.values[0], attr->syntax->ldap_oid);
3384         if (!dsdb_dn) {
3385                 ldb_asprintf_errstring(ldb, "Failed to parse DN in linked attribute blob for %s on %s\n",
3386                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3387                 return LDB_ERR_OPERATIONS_ERROR;
3388         }
3389
3390         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3391         if (!NT_STATUS_IS_OK(ntstatus)) {
3392                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s\n",
3393                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3394                 return LDB_ERR_OPERATIONS_ERROR;
3395         }
3396
3397         /* see if this link already exists */
3398         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid);
3399         if (pdn != NULL) {
3400                 /* see if this update is newer than what we have already */
3401                 struct GUID invocation_id = GUID_zero();
3402                 uint32_t version = 0;
3403                 NTTIME change_time = 0;
3404                 bool was_active = ldb_dn_get_extended_component(pdn->dsdb_dn->dn, "DELETED") == NULL;
3405
3406                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3407                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3408                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3409
3410                 if (!replmd_update_is_newer(&invocation_id,
3411                                             &la->meta_data.originating_invocation_id,
3412                                             version,
3413                                             la->meta_data.version,
3414                                             change_time,
3415                                             la->meta_data.originating_change_time)) {
3416                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3417                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3418                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3419                         talloc_free(tmp_ctx);
3420                         return LDB_SUCCESS;
3421                 }
3422
3423                 /* get a seq_num for this change */
3424                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3425                 if (ret != LDB_SUCCESS) {
3426                         talloc_free(tmp_ctx);
3427                         return ret;
3428                 }
3429
3430                 if (was_active) {
3431                         /* remove the existing backlink */
3432                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3433                         if (ret != LDB_SUCCESS) {
3434                                 talloc_free(tmp_ctx);
3435                                 return ret;
3436                         }
3437                 }
3438
3439                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3440                                            &la->meta_data.originating_invocation_id,
3441                                            la->meta_data.originating_usn, seq_num,
3442                                            la->meta_data.originating_change_time,
3443                                            !active);
3444                 if (ret != LDB_SUCCESS) {
3445                         talloc_free(tmp_ctx);
3446                         return ret;
3447                 }
3448
3449                 if (active) {
3450                         /* add the new backlink */
3451                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3452                         if (ret != LDB_SUCCESS) {
3453                                 talloc_free(tmp_ctx);
3454                                 return ret;
3455                         }
3456                 }
3457         } else {
3458                 /* get a seq_num for this change */
3459                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3460                 if (ret != LDB_SUCCESS) {
3461                         talloc_free(tmp_ctx);
3462                         return ret;
3463                 }
3464
3465                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3466                                                 struct ldb_val, old_el->num_values+1);
3467                 if (!old_el->values) {
3468                         ldb_module_oom(module);
3469                         return LDB_ERR_OPERATIONS_ERROR;
3470                 }
3471                 old_el->num_values++;
3472
3473                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3474                                           &la->meta_data.originating_invocation_id,
3475                                           la->meta_data.originating_usn, seq_num,
3476                                           la->meta_data.originating_change_time,
3477                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3478                 if (ret != LDB_SUCCESS) {
3479                         talloc_free(tmp_ctx);
3480                         return ret;
3481                 }
3482
3483                 if (active) {
3484                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3485                                                   true, attr, false);
3486                         if (ret != LDB_SUCCESS) {
3487                                 talloc_free(tmp_ctx);
3488                                 return ret;
3489                         }
3490                 }
3491         }
3492
3493         /* we only change whenChanged and uSNChanged if the seq_num
3494            has changed */
3495         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3496                 talloc_free(tmp_ctx);
3497                 return LDB_ERR_OPERATIONS_ERROR;
3498         }
3499
3500         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3501                 talloc_free(tmp_ctx);
3502                 return LDB_ERR_OPERATIONS_ERROR;
3503         }
3504
3505         ret = dsdb_module_modify(module, msg, 0);
3506         if (ret != LDB_SUCCESS) {
3507                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s' %s\n",
3508                           ldb_errstring(ldb),
3509                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3510                 talloc_free(tmp_ctx);
3511                 return ret;
3512         }
3513
3514         talloc_free(tmp_ctx);
3515
3516         return ret;
3517 }
3518
3519 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3520 {
3521         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3522                 return replmd_extended_replicated_objects(module, req);
3523         }
3524
3525         return ldb_next_request(module, req);
3526 }
3527
3528
3529 /*
3530   we hook into the transaction operations to allow us to
3531   perform the linked attribute updates at the end of the whole
3532   transaction. This allows a forward linked attribute to be created
3533   before the object is created. During a vampire, w2k8 sends us linked
3534   attributes before the objects they are part of.
3535  */
3536 static int replmd_start_transaction(struct ldb_module *module)
3537 {
3538         /* create our private structure for this transaction */
3539         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3540                                                                 struct replmd_private);
3541         replmd_txn_cleanup(replmd_private);
3542
3543         /* free any leftover mod_usn records from cancelled
3544            transactions */
3545         while (replmd_private->ncs) {
3546                 struct nc_entry *e = replmd_private->ncs;
3547                 DLIST_REMOVE(replmd_private->ncs, e);
3548                 talloc_free(e);
3549         }
3550
3551         return ldb_next_start_trans(module);
3552 }
3553
3554 /*
3555   on prepare commit we loop over our queued la_context structures and
3556   apply each of them
3557  */
3558 static int replmd_prepare_commit(struct ldb_module *module)
3559 {
3560         struct replmd_private *replmd_private =
3561                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3562         struct la_entry *la, *prev;
3563         struct la_backlink *bl;
3564         int ret;
3565
3566         /* walk the list backwards, to do the first entry first, as we
3567          * added the entries with DLIST_ADD() which puts them at the
3568          * start of the list */
3569         for (la = replmd_private->la_list; la && la->next; la=la->next) ;
3570
3571         for (; la; la=prev) {
3572                 prev = la->prev;
3573                 DLIST_REMOVE(replmd_private->la_list, la);
3574                 ret = replmd_process_linked_attribute(module, la);
3575                 if (ret != LDB_SUCCESS) {
3576                         replmd_txn_cleanup(replmd_private);
3577                         return ret;
3578                 }
3579         }
3580
3581         /* process our backlink list, creating and deleting backlinks
3582            as necessary */
3583         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3584                 ret = replmd_process_backlink(module, bl);
3585                 if (ret != LDB_SUCCESS) {
3586                         replmd_txn_cleanup(replmd_private);
3587                         return ret;
3588                 }
3589         }
3590
3591         replmd_txn_cleanup(replmd_private);
3592
3593         /* possibly change @REPLCHANGED */
3594         ret = replmd_notify_store(module);
3595         if (ret != LDB_SUCCESS) {
3596                 return ret;
3597         }
3598
3599         return ldb_next_prepare_commit(module);
3600 }
3601
3602 static int replmd_del_transaction(struct ldb_module *module)
3603 {
3604         struct replmd_private *replmd_private =
3605                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3606         replmd_txn_cleanup(replmd_private);
3607
3608         return ldb_next_del_trans(module);
3609 }
3610
3611
3612 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3613         .name          = "repl_meta_data",
3614         .init_context      = replmd_init,
3615         .add               = replmd_add,
3616         .modify            = replmd_modify,
3617         .rename            = replmd_rename,
3618         .del               = replmd_delete,
3619         .extended          = replmd_extended,
3620         .start_transaction = replmd_start_transaction,
3621         .prepare_commit    = replmd_prepare_commit,
3622         .del_transaction   = replmd_del_transaction,
3623 };